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Fairfax Square, as pictured in the city's project record

Fairfax Square

Under Review

Private Development · 9840-9946 Main Street, Fairfax, VA 22030 · topic history · city record ↗ · on the map

138 units · 59,000 sq ft retail · 5 stories · 10.47 acres

Screening estimates. These figures rank likely magnitudes with stated assumptions and ranges — they are decision-support context, not predictions. Every number traces to a source or a named assumption in the appendices below. Formulas, citations, and limitations: methodology report (PDF).

In plain terms: the project would add roughly 236 residents and about $706k a year in new property tax, but serving those residents costs money too. Counting the city services that actually grow with new residents, that nets out to a net gain of about $625k a year, anywhere between a net cost of about $365k a year and a net gain of about $2.0M a year across the assumption ranges. Fixed citywide costs are not charged to new residents; school costs follow the project's own student estimate.

Where the effects land

Loading map…

The economic map shows total captured spending by business location and named reporting clusters. The walk map uses a tighter extent around walk-arriving capture and the street segments assigned new resident walk trips; the bike map (when present) shows bike-arriving capture across the city — bikes reach farther, so it spreads wider and thinner. Dollar heatmaps are clipped to CR (Commercial Retail) zoning, and each map is scaled to its own data, so colors are not comparable across maps.

Summary

Fairfax Square is a mixed-use redevelopment proposal at the end of Burke Station Road in the City of Fairfax, Virginia, covering 10.47 acres across three parcels. The applicant proposes to replace 12 existing commercial buildings totaling 126,535 square feet with 138 residential units (including 11 affordable units at 60% AMI), up to 59,000 square feet of new commercial space, and the retention of 70,906 square feet of existing office and commercial space in two buildings. The headline fiscal finding, under the marginal-framing method, is a net annual fiscal impact ranging from −$364,512 to +$1,989,780, with a central estimate of approximately +$624,700 per year; that wide range reflects genuine uncertainty in the cost and value assumptions rather than a prediction. The project's own ground-floor retail is projected (as a screening estimate) to capture $75,767–$211,694 per year of new-resident spending, and the Huff model's screening estimate places the largest share of remaining new-resident retail spending at the Fairchester Drive & Hill Street cluster. The three assumptions to which the resident-count estimate — and, by extension, nearly every downstream figure — is most sensitive are: (1) average household size for multifamily units (central 1.8, range 1.5–2.2); (2) occupancy rate (central 0.95, range 0.9–0.97); and (3) the new-construction income premium (central 1.125, range 1.0–1.25), which drives spending estimates and, through assessed-value comparables, the real estate tax projection.


View metric methods and calculations →

Adjust the assumptions

Every estimate above rests on named assumptions with published ranges. If you have better local knowledge, move the sliders — adjusted values use the exact formulas of the pipeline, bounded by each assumption's sensitivity range. Travel and destination-choice parameters are excluded (they require a full model re-run). Nothing is saved or submitted.

Assumptions

Occupancy rate
0.95
0.9published: 0.950.97

share of proposed units occupied at stabilization

Household size (multifamily)
1.8
1.5published: 1.82.2

persons per occupied new multifamily unit for a typical studio/1BR/2BR mix

New-construction income premium
1.125
1published: 1.1251.25

new-construction multifamily rents draw higher-income households than the area median

Spending-survey scaling
1
0.85published: 11.15

CES line items are national averages; ±15% covers regional and vintage drift

Walk trips per resident per day
1
0.5published: 12

scales new residents into all-purpose daily walk trips for the foot-traffic flow allocation

Sq ft per office job
350
250published: 350500

existing commercial sqft -> displaced jobs; a higher value yields fewer displaced jobs per sqft

Sq ft per retail job
500
400published: 500700

proposed retail sqft -> on-site jobs

Assessed value per dwelling unit ($)
360,982.5
359,599.256published: 360,982.5458,932.463

median assessed value per unit across 3 apartment-class comps, 25th-75th percentile bounds

Retail value per sq ft ($)
275
200published: 275400

assessed $/sqft applied to proposed retail space; refine with commercial comps in a follow-up

Office value per sq ft ($)
300
200published: 300450

assessed $/sqft applied to proposed non-retail commercial space (office, medical, bank). Previously omitted, which valued every proposed office at zero

Office gross receipts per sq ft ($/yr)
500
300published: 500800

rough-estimate input: the BPOL base for office tenants

Business equipment value per sq ft ($)
8
4published: 815

rough-estimate input: the business tangible personal property base across proposed retail and office space

Share of on-site sales that is new to the city
0.3
0.15published: 0.30.5

share of the project's own on-site receipts that is NEW to the city (new resident and visitor demand, plus sales recaptured from outside) rather than displaced from existing city businesses; displaced sales move the tax base, they do not add to it

Restaurant share of ground-floor space
0.5
0.3published: 0.50.7

share of the project's ground-floor space occupied by restaurants (the meals-tax base) rather than shop retail

Students per unit
0.08
0.05published: 0.080.12

drives the school-cost component when the education transfer and enrollment are pinned (school-split cost model); otherwise informs the school note only

Marginal cost factor
0.35
0.25published: 0.350.55

share of the NON-school per-capita cost that scales at the margin (school costs follow the student estimate directly under the school-split model)

Vehicles per household
1.4
1published: 1.41.8

rough-estimate input: converts new households to taxable vehicles for the personal property levy

Assessed value per vehicle ($)
14,000
9,000published: 14,00020,000

rough-estimate input: average taxable value per vehicle; no project-specific fleet data exists

Retail sales per sq ft ($/yr)
400
250published: 400600

rough-estimate input: annual gross receipts per sqft for the BPOL base; the low bound absorbs vacancy and lease-up

Requires a full model re-run

These parameters sit inside the travel/destination-choice model, so their effect on the results is not a simple rescaling — they cannot be adjusted live.

Walk-time decay (β)0.1 (0.05–0.15)
Walk share — neighborhood trips0.6 (0.4–0.8)
Walk share — comparison goods0.1 (0–0.3)
Walk share — grocery/entertainment0.3 (0.1–0.5)
Bike-time decay (β)0.1 (0.05–0.15)
Bike share — neighborhood trips0.02 (0.005–0.05)
Bike share — comparison goods0.005 (0–0.02)
Bike share — grocery/entertainment0.01 (0–0.03)
Own-retail sq ft per equivalent business2,000 (1,500–3,000)

Recomputed estimates

Economic

MetricPublishedAdjustedΔ
New households131131—
New residentsheadline236236—
Aggregate household income$24.16M$24.16M—
New annual spending: grocery$976k$976k—
New annual spending: restaurant_bar$854k$854k—
New annual spending: retail_comparison$1.07M$1.07M—
New annual spending: retail_convenience$178k$178k—
New annual spending: personal_services$246k$246k—
New annual spending: entertainment$889k$889k—
Annual capture: Fairchester Drive & Hill Street$1,000k$1,000k—
Annual capture: Chain Bridge Road & North Street$683k$683k—
Annual capture: Mathy Drive & Pickett Road$391k$391k—
Annual capture: Fair Lakes Parkway & Fair Oaks Mall$305k$305k—
Annual capture: Blenheim Boulevard & Fairfax Boulevard$193k$193k—
Annual capture: project's own ground-floor retailheadline$140k$140k—
On-site jobs removed (existing space)362362—
On-site retail jobs added118118—
On-site office jobs added203203—
Net on-site job change−40.9−40.9—
New annual spending arriving on footheadline$142k$142k—
New annual spending arriving by bike$48k$48k—
Spending arriving on foot at project's own retail$70k$70k—
Implied spending per resident walk trip$2$2—
New resident walk trips per day236236—

Fiscal

MetricPublishedAdjustedΔ
Projected assessed value$87.31M$87.31M—
Projected real estate tax$936k$936k—
Real estate tax increaseheadline$706k$706k—
Personal property tax on resident vehicles (rough estimate)$106k$106k—
BPOL business license tax on project retail (rough estimate)$14k$14k—
BPOL business license tax on project office (rough estimate)$142k$142k—
Business tangible property tax (rough estimate)$43k$43k—
Meals tax on captured in-city dining$26k$26k—
Meals tax on the project's own restaurants (net-new, rough estimate)$158k$158k—
Local sales tax share on captured in-city retail$14k$14k—
Local sales tax on the project's own retail (net-new, rough estimate)$70k$70k—
Annual school cost within the service-cost estimates$220k$220k—
Annual service cost — marginal framing$654k$654k—
Estimated K-12 students1111—
Net annual fiscal impact — marginal framingheadline$625k$625k—

Adjusted values are exact recomputations of the model's central estimates for the assumptions above — the same arithmetic the pipeline runs, evaluated in your browser. Published ranges, maps, and the narrative report are not recomputed here.

Full analysis

Project description

The site consists of three tax parcels — 58-3-02-013C, 58-3-02-013A, and 48-3-14-002B — with a stated area of 10.47 acres located at the end of Burke Station Road in the City of Fairfax, Virginia. The project is currently under review.

Existing condition. Twelve existing commercial buildings comprising 126,535 square feet are present on the site, accommodating a variety of uses including office, medical, personal services, retail, and church uses. There are no existing residential units. No current assessed value for the parcels was available at a confidence level sufficient to use in this analysis; the current real estate tax figure is drawn directly from the City's assessment database.

Proposed condition. The applicant proposes a redevelopment that would deliver 138 total residential units across the property — described in the most recent formal submission documents as 90 multifamily units and 48 single-family attached units — of which a minimum of 11 units are committed as affordable at 60% of Area Median Income, to be constructed within the first multifamily building. The non-residential program consists of up to 59,000 square feet of new commercial uses in new buildings and the retention of 70,906 square feet of office and commercial space in two existing buildings, including the existing five-story office building at 9900 Main Street. New commercial buildings are described in the Statement of Support as one- and two-story structures. Residential tenure is not established in the project documents; rental defaults are used throughout this analysis. Parking space counts are not established at sufficient confidence to report.

Note on document versions: Earlier pre-application materials (the Briefing Submission) described a substantially different program of approximately 293–300 multifamily units and 44 affordable units. The figures used throughout this report are drawn from the later, more authoritative formal submission documents (Statement of Support and Draft Commitments), which govern the current application as filed.


Economic effects

New demand. Under the occupancy and household-size assumptions described above, the 138 proposed units are projected to yield 124–134 occupied households (central: 131) and 186–294 new residents (central: 236), applying the method of multiplying households by Rutgers CUPR bedroom-mix persons-per-unit multipliers for multifamily. Those households are estimated to generate aggregate annual income of $20.3 million–$27.4 million (central: ~$24.2 million), computed as households multiplied by the mean income of site tract 51600300300 from ACS 5-year 2024 data ($163,796) and a new-construction income premium.

Spending by category. Applying BLS Consumer Expenditure Survey 2023 figures scaled by income and per-category Engel elasticities, new-resident annual spending is estimated across six categories: grocery ($745,735–$1,202,271, central ~$976,485); restaurants and bars ($622,041–$1,096,480, central ~$853,809); comparison retail ($771,096–$1,389,891, central ~$1,070,940); convenience retail ($133,409–$222,402, central ~$177,803); personal services ($178,162–$317,572, central ~$245,988); and entertainment ($632,276–$1,165,387, central ~$888,544).

Where spending is captured — retail clusters. These capture figures are screening estimates. They are computed using a Huff model over individual retail points of interest, in which each destination's probability of capture is proportional to its attractiveness and inversely proportional to a walk- and drive-time decay function. Clusters are a reporting rollup of those individual POI-level results. The model identifies the following as the top destinations for new-resident spending:

  1. Fairchester Drive & Hill Street — central capture ~$999,812/yr (range $758,733–$1,192,733), led by grocery spending in that cluster.
  2. Chain Bridge Road & North Street — central capture ~$683,359/yr (range $492,190–$944,415), with a notable entertainment component.
  3. Mathy Drive & Pickett Road — central capture ~$390,836/yr (range $279,019–$582,409).
  4. Fair Lakes Parkway & Fair Oaks Mall — central capture ~$304,770/yr (range $223,254–$351,598), dominated by comparison retail.
  5. Blenheim Boulevard & Fairfax Boulevard — central capture ~$192,599/yr (range $143,143–$272,069).

The Huff model also estimates that 62.0%–66.5% (central: ~62.0%) of all new-resident retail spending and 64.1%–73.0% (central: ~66.4%) of food-away-from-home spending lands at destinations inside the city boundary, computed as the share of Huff-modeled capture at destinations within the city.

Project's own retail capture. This figure is a screening estimate. The project's proposed ground-floor commercial space (up to 59,000 square feet new, plus the retained space) competes as a destination in the same Huff model. New-resident spending captured by the project's own ground-floor retail is estimated at $75,767–$211,694 per year (central: ~$139,781), with restaurants and bars as the largest component, followed by convenience retail and comparison retail.

Foot-traffic. This figure is a screening estimate. Exact marginal trip flows from the site — modeled using POI-weighted destinations and walk-time decay along the OpenStreetMap network — yield an estimated foot-traffic index change of +0.2% on the 10 nearest commercial street segments, measured against a seeded sampled betweenness baseline of today's population. This is not a calibrated pedestrian count comparison. Walk-arriving spending at the project's own retail is estimated at $23,218–$148,151 per year (central: ~$70,232), and new annual spending arriving on foot across all destinations is estimated at $27,927–$1,184,579 (central: ~$141,662); the wide range on the latter reflects the sensitivity of walk-mode share assumptions (beta_walk: 0.05–0.15; walk_share_neighborhood: 0.4–0.8).

Jobs ledger. Using a sqft-per-job conversion method applied to the respective square footages, the analysis estimates the following on-site job changes:

  • Jobs removed (existing 126,535 sq ft / sqft-per-office-job): 253–506 jobs (central: ~362), computed as existing commercial square footage divided by sqft-per-office-job.
  • Retail jobs added (proposed 59,000 sq ft / sqft-per-retail-job): 84–148 jobs (central: 118), computed as proposed retail square footage divided by sqft-per-retail-job.
  • Office jobs added (retained 70,906 sq ft / sqft-per-office-job): 142–284 jobs (central: ~203), computed as proposed office square footage divided by sqft-per-office-job.
  • Net on-site job change (retail added + office added − existing removed): −280 to +178 jobs (central: approximately −41).

The net job range spans negative to positive because the sqft-per-job assumption applies to both the removed and retained/new space, and its range (250–500 sq ft per office job; 400–700 sq ft per retail job) is wide enough to change the sign of the net result. The existing buildings being removed are noted as older and potentially part-vacant, which may support a higher sqft-per-worker ratio than modern occupied fit-out.


Fiscal effects

Current real estate tax. The three subject parcels currently generate $230,412 per year in real estate tax revenue, computed as current assessed value multiplied by the City's real estate tax rate.

Projected real estate tax. Post-redevelopment assessed value is projected at $75,605,897–$118,840,380 (central: ~$87,312,385), computed as proposed units multiplied by assessed value per unit (based on three City apartment comparables built since 2011: $359,599–$458,932 per unit), plus proposed retail square footage multiplied by a commercial assessed value per square foot ($200–$400/sq ft, central $275), plus proposed office square footage multiplied by an office assessed value per square foot ($200–$450/sq ft, central $300). Projected real estate tax on the redeveloped site is $810,873–$1,274,563 per year (central: ~$936,425), producing a real estate tax increase of $580,462–$1,044,151 per year (central: ~$706,014) over the current tax, computed as projected minus current real estate tax.

Other recurring revenue lines. Several additional revenue streams are estimated, with the rougher estimates noted:

  • Personal property tax on resident vehicles (rough estimate): $46,165–$199,023/yr (central: ~$106,123), computed as new households multiplied by assumed vehicles per household (1.0–1.8, central 1.4) multiplied by assumed average vehicle assessed value ($9,000–$20,000, central $14,000) multiplied by the City's personal property tax rate. No project-specific vehicle data exists; treat as order-of-magnitude.
  • BPOL business license tax on project retail (rough estimate): $4,383–$35,260/yr (central: ~$14,076), computed as proposed retail square footage multiplied by assumed gross sales per square foot ($250–$600, central $400) multiplied by the BPOL retail rate, multiplied by a net-new share (0.15–0.50, central 0.30) to avoid double-counting sales displaced from existing city businesses.
  • BPOL business license tax on project office (rough estimate): $85,087–$226,899/yr (central: ~$141,812), computed as proposed office square footage multiplied by assumed gross receipts per square foot ($300–$800, central $500) multiplied by the BPOL professional rate. This line is not displacement-adjusted, as professional and medical practices are assumed to serve regional demand.
  • Business tangible property tax (rough estimate): $21,460–$80,477/yr (central: ~$42,921), computed as proposed commercial square footage multiplied by assumed equipment value per square foot ($4–$15, central $8) multiplied by the City's personal property tax rate.
  • Meals tax on captured in-city dining: $17,940–$36,031/yr (central: ~$25,513), computed as new-resident restaurant spending multiplied by the in-city Huff capture share and the City meals tax rate.
  • Meals tax on the project's own restaurants (rough estimate, net-new): $29,586–$555,348/yr (central: ~$158,356), computed as ground-floor square footage multiplied by assumed sales per square foot, multiplied by an assumed restaurant share of retail (0.3–0.7, central 0.5), the meals tax rate, and the net-new share. The wide range reflects the stacked sensitivity of sales-per-sqft, restaurant-share, and net-new-share assumptions.
  • Local sales tax share on captured in-city retail: $10,004–$18,714/yr (central: ~$13,800), computed as in-city captured retail spending multiplied by the local sales tax share under Virginia Code § 58.1-605.
  • Local sales tax on the project's own retail (rough estimate, net-new): $21,915–$176,301/yr (central: ~$70,381), computed as ground-floor square footage multiplied by assumed sales per square foot, the local sales tax share, and the net-new share.

Service costs and the two framing methods. This analysis uses a marginal framing to estimate annual service costs. Under this method, the non-school per-capita cost derived from the FY2027 City General Fund budget (computed as total non-education general fund expenditures of $207,912,496 minus the school tuition of $76,429,791, divided by 25,026 residents, yielding $5,254 per capita) is multiplied by the number of new residents and by a marginal cost factor (0.25–0.55, central 0.35), on the rationale that fixed services such as roads and administration do not scale proportionally with infill residents. School costs are treated separately: estimated K-12 students of 6.9–16.6 (central: ~11.0, computed as proposed units multiplied by a students-per-unit rate of 0.05–0.12, central 0.08) are multiplied by the net local cost per pupil of $19,961, derived as the FY2027 FCPS tuition contract estimate of $76,429,791 minus $14,492,271 in state education revenue, divided by 3,103 students. The resulting school cost component is $137,728–$330,546/yr (central: ~$220,364). Total service cost under the marginal framing is $382,425–$1,181,515 per year (central: ~$654,295).

The marginal framing deliberately understates costs if the project triggers a capacity expansion in any City service; the marginal cost factor's range of 0.25–0.55 is intended to carry that uncertainty. A proportional (average-cost) framing — which would allocate the full per-capita cost to each new resident rather than the marginal share — is not computed in this version but would yield a higher cost estimate and a correspondingly narrower or potentially negative net fiscal range.

Net annual fiscal impact. Under the marginal framing, the net annual fiscal impact — incremental recurring revenues minus the marginal service cost — is estimated at −$364,512 to +$1,989,780 per year, with a central estimate of approximately +$624,700 per year. The range crosses zero, meaning this analysis cannot rule out a net fiscal cost to the City under unfavorable assumption combinations. The main sources of the wide range are: the marginal cost factor (0.25–0.55), the residential assessed value per unit ($359,599–$458,932), and the stacked rough estimates on BPOL, meals tax, and sales tax lines. No external fiscal estimates were provided with this project; there is accordingly no published figure to compare against.


Not evaluated in this version

Analyses of the proposed bike-lane corridor, trail connections, broader pedestrian-network connectivity, environmental effects (stormwater, tree canopy, urban heat), and any comparable-places benchmarking have not been computed and are deferred to future modules. The narrative above addresses only the economic and fiscal dimensions derived from the structured module results provided.

Method notes & caveats

  • Huff capture is a screening estimate computed per business location (every retail POI is an individual destination) and aggregated to named areas for reporting; it ranks where new spending is likely to land, with sensitivity bounds — it is not a prediction.
  • Residential tenure (for-sale vs rental) is not established in the project documents; rental defaults are used for household size, occupancy, and the income premium. For-sale product would raise all three.
  • The project's own retail is included as a competing destination; its capture estimates how much of the residents' spending the ground floor itself can hold on to.
  • Displaced use: 12 existing commercial buildings comprising office, medical, personal services, retail, and church uses. Any spending that originated on-site today is assumed negligible relative to the new residential demand.
  • Bike-arriving capture models cycling as a third mode alongside walking and driving: the bike preference is taken from the drive remainder (walk shares are unchanged), and bikes reach ~3-4x the walking distance per minute of travel time.
  • Foot-traffic flows are exact allocations of the new residents' modeled walk trips; the % comparison uses a sampled index of today's walkers, not calibrated pedestrian counts.
  • Walk-in capture per business is the walk-arriving share of the NEW residents' spending under a joint destination-and-mode choice: walking competes with driving per destination, so businesses beyond practical walking range receive effectively none of it and the rest of the spending arrives by car. It is not total pedestrian commerce. Comparing a business's walk-in capture to its total capture shows how much of its projected gain depends on being within walking distance of the project.
  • Personal property tax is a rough estimate: the city rate is pinned, but vehicles per household and average vehicle value are assumptions, not observed data. Pinning per-household budget actuals would replace this estimate.
  • On-site commercial tax lines exclude $139,781/yr of new-resident spending at the project's own ground floor, which is already counted in full in the resident-capture lines.
  • BPOL revenue is a rough estimate: the city rate schedule is pinned, but tenant gross receipts are assumed from a sales-per-sqft range.
  • School costs use the split model: 11 students (7-17) x $19,961 net local cost per pupil ≈ $220,364/yr in the service-cost estimate — a development generating fewer students carries proportionally lower costs instead of the school-heavy citywide average.
  • Service costs use the marginal framing: only services that scale with new residents, plus the project's own students at the net local cost per pupil. It understates costs if a service-capacity expansion is triggered; the marginal cost factor's range carries that uncertainty.
  • The revenue side includes the rough-estimate personal property and BPOL lines: leaving them at zero would understate revenue for taxes the city does levy, but both carry wide assumption-driven bounds.

Data sources

Computed Sep 14, 2026 · narrative by claude-sonnet-4-6 over deterministic model output (v3)