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Development project

Lamb Center/Wesley Housing

Under Construction

Private Development · 9640 Fairfax Blvd, Fairfax, VA 22030 · topic history · city record ↗

54 units · 5 stories · 0.41 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 92.3 residents and about $203k a year in new property tax, but serving those residents costs money too. Depending on how you count the cost of city services for new residents, that nets out anywhere between a net cost of about $307k a year and roughly break-even. The strict accounting (every resident carries a full share of today's citywide costs) gives the costlier figure; counting only costs that actually grow with new residents gives the friendlier one. The likely answer sits in between.

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

The Lamb Center/Wesley Housing project proposes to redevelop a 12-room motel at 9640 Fairfax Boulevard into a five-story, 54-unit permanent supportive housing building with 1,400 square feet of office space, all 54 units offered to renters at or below 50% of area median income. The project is currently under construction. On the fiscal side, this analysis estimates an increase in annual real estate tax of $200,743–$262,025, while the net recurring fiscal position spans a wide range — from approximately −$502,090 to +$218,929 per year — depending on which cost method is applied and where key assumptions fall within their bounds. On the economic side, new residents are estimated at 73 to 115, and new annual household spending across all tracked categories ranges into the millions, with comparison retail and entertainment representing the two largest spending clusters; the Huff-model capture figures and foot-traffic index change are screening estimates only. The three assumptions to which the net fiscal outcome is most sensitive are: the average household size assumed for new multifamily residents (range 1.5–2.2 persons per unit), the student generation rate per unit (range 0.05–0.12 students per unit), and the marginal cost factor applied to non-school public services (range 0.25–0.55).


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

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

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 (0.050.15)
Walk share — neighborhood trips0.6 (0.40.8)
Walk share — comparison goods0.1 (00.3)
Walk share — grocery/entertainment0.3 (0.10.5)
Bike-time decay (β)0.1 (0.050.15)
Bike share — neighborhood trips0.02 (0.0050.05)
Bike share — comparison goods0.005 (00.02)
Bike share — grocery/entertainment0.01 (00.03)
Own-retail sq ft per equivalent business2,000 (1,5003,000)
Share of on-site sales that is new to the city0.3 (0.150.5)
Restaurant share of ground-floor space0.5 (0.30.7)
Retail sales per sq ft ($/yr)400 (250600)

Recomputed estimates

Economic

MetricPublishedAdjustedΔ
New households51.351.3
New residentsheadline92.392.3
Aggregate household income$11.26M$11.26M
New annual spending: grocery$413k$413k
New annual spending: restaurant_bar$388k$388k
New annual spending: retail_comparison$495k$495k
New annual spending: retail_convenience$77k$77k
New annual spending: personal_services$113k$113k
New annual spending: entertainment$418k$418k
Annual capture: Fairchester Drive & Hill Street$417k$417k
Annual capture: Blenheim Boulevard & Fairfax Boulevard$280k$280k
Annual capture: Chain Bridge Road & North Street$203k$203k
Annual capture: Mathy Drive & Pickett Road$138k$138k
Annual capture: Fair Lakes Parkway & Fair Oaks Mall$137k$137k
On-site jobs removed (existing space)00
On-site retail jobs added00
On-site office jobs added44
Net on-site job change44
New annual spending arriving on footheadline$131k$131k
New annual spending arriving by bike$18k$18k
Implied spending per resident walk trip$4$4
New resident walk trips per day92.392.3

Fiscal

MetricPublishedAdjustedΔ
Projected assessed value$19.91M$19.91M
Projected real estate tax$214k$214k
Real estate tax increaseheadline$203k$203k
Personal property tax on resident vehicles (rough estimate)$42k$42k
BPOL business license tax on project office (rough estimate)$2,800$2,800
Business tangible property tax (rough estimate)$463$463
Meals tax on captured in-city dining$11k$11k
Local sales tax share on captured in-city retail$5,758$5,758
Annual school cost within the service-cost estimates$86k$86k
Annual service cost — naive per-capita method$571k$571k
Annual service cost — marginal framing$256k$256k
Estimated K-12 students4.34.3
Net annual fiscal impact — naive per-capita methodheadline−$307k−$307k
Net annual fiscal impact — marginal framingheadline$8,811$8,811
Net annual fiscal impact (range across both cost methods)−$149k−$149k

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 is parcel 48-3-09-020, located at 9640 Fairfax Boulevard, comprising 0.41 acres. The existing use is a 12-room Hy-Way Motel. The project documents do not provide a square footage figure for the existing structure, and existing assessed value and existing job counts are not reported in the source documents; those fields carry low extraction confidence.

The proposal replaces the motel with a new five-story structure containing 54 residential rental units on floors 2 through 5 and 1,400 square feet of office space on the ground floor, along with 18 parking spaces (5 dedicated to the commercial space and 13 to residential uses, per the November 2022 Summary of Commitments). All 54 units are designated affordable, offered to persons at or below 50% of area median income through long-term leases. No retail square footage is explicitly stated in numeric terms in the project documents; the Traffic Impact Analysis (TIA), the most authoritative document on the building program, records all non-residential floor area solely as "1,400 SF of office." The project status is under construction.


Economic effects

New demand. Using a stabilized occupancy rate of 0.95 (range 0.90–0.97), the 54 proposed units are estimated to yield 48.6–52.4 occupied households, computed as proposed units multiplied by the occupancy rate. Applying Rutgers CUPR multifamily bedroom-mix multipliers (Listokin et al. 2006), households are converted to an estimated 73–115 new residents (central estimate 92, computed as households multiplied by persons per multifamily unit).

The aggregate annual household income of new residents is estimated by multiplying households by the mean income of Census tract 51600300200 ($195,124 from ACS 5-year 2024, tables B19025/B11001) and a new-construction income premium assumption (range 1.0–1.25, central 1.125). This yields an aggregate income range of approximately $9.5 million to $12.8 million per year. That figure is used to scale per-category consumer spending via BLS Consumer Expenditure Survey 2023 line items and Engel-gradient elasticities by category; it is an input to the spending estimates, not itself a revenue figure for the city.

Spending clusters and capture. New annual household spending by category (computed as households multiplied by CES category spend scaled by an income ratio raised to the category elasticity) is estimated as follows: grocery, $316,000–$509,000; restaurants and bars, $282,000–$498,000; comparison retail (apparel, furnishings), $356,000–$642,000; convenience retail, $58,000–$97,000; personal services, $82,000–$145,000; entertainment, $297,000–$548,000.

These capture figures are screening estimates. The Huff model allocates this spending across individual retail points of interest using a joint destination-and-mode choice, P(j,m) ~ A_j × w_m × exp(−b_m × t_mj), and clusters the results by named area for reporting. The top clusters by estimated annual capture are:

  • Fairchester Drive & Hill Street: $321,759–$502,495 per year (led by grocery and comparison retail)
  • Blenheim Boulevard & Fairfax Boulevard: $165,483–$434,758 per year (led by restaurants and bars)
  • Chain Bridge Road & North Street: $153,184–$261,764 per year (led by entertainment and comparison retail)
  • Mathy Drive & Pickett Road: $103,444–$180,646 per year
  • Fair Lakes Parkway & Fair Oaks Mall: $101,941–$155,567 per year (led by comparison retail)

The in-city capture share is estimated at 56.7%–61.9% across all retail categories and 61.6%–69.6% for food-away-from-home specifically, computed as the Huff model's share of capture landing at destinations inside the city boundary.

Project's own ground-floor retail capture. The project's 1,400 square feet of ground-floor space is recorded in all TIA documents as office, not retail. Because no retail square footage is specified in the program, the annual capture at the project's own ground-floor retail is $0 (range $0–$0). The Huff model included the project's own space as a competing destination; it returned no capture because no retail square footage entered the model.

Foot-traffic index change. The foot-traffic index change across the 10 nearest commercial street segments is computed as the exact marginal trip flows from the site (using POI-weighted destinations and exponential walk-decay shortest paths) compared against a seeded sampled baseline betweenness of today's population. This is a screening estimate. The computed value is 0%, with no low/high bounds reported. The metric note states that the percentage comparison uses a sampled index of today's walkers, not calibrated pedestrian counts.

Jobs ledger. On-site office jobs added are estimated at 2.8–5.6 (central 4), computed as 1,400 square feet of proposed office divided by an assumed 250–500 square feet per office job. No retail square footage enters the model, so on-site retail jobs added are 0. No existing commercial square footage is recorded for the motel, so jobs removed from existing space are also 0. Net on-site job change is therefore 2.8–5.6 jobs, computed as retail jobs added plus office jobs added minus existing jobs removed.


Fiscal effects

Real estate tax — current vs. projected. The current annual real estate tax on parcel 48-3-09-020 is $10,522, computed as the current assessed value multiplied by the applicable rate and divided by 100. The projected assessed value after construction is estimated at $19,698,360–$25,412,353 (central $19,913,055), computed as proposed units multiplied by assessed value per unit (derived from three City of Fairfax apartment-class comparable parcels built since 2011, ranging from $359,599 to $458,932 per unit) plus proposed office square footage multiplied by an assumed office assessed value per square foot ($200–$450/sqft). The projected annual real estate tax is therefore $211,265–$272,547 (central $213,568), yielding a real estate tax increase of $200,743–$262,025 per year.

Other recurring revenue lines. Additional revenue lines are estimated as follows (all are rough estimates where labeled as such):

  • Personal property tax on resident vehicles (rough estimate): $18,065–$77,879 per year, computed as new households multiplied by an assumed vehicles-per-household figure (range 1.0–1.8, central 1.4) multiplied by an assumed average vehicle assessed value (range $9,000–$20,000, central $14,000) multiplied by the city personal property tax rate.
  • BPOL business license tax on project office (rough estimate): $1,680–$4,480 per year, computed as proposed office square footage multiplied by an assumed gross receipts per square foot (range $300–$800, central $500) multiplied by the city's professional/business-services BPOL rate.
  • Business tangible personal property tax (rough estimate): $231–$867 per year, computed as proposed commercial square footage multiplied by an assumed equipment value per square foot (range $4–$15, central $8) multiplied by the city's personal property tax rate.
  • Meals tax on captured in-city dining: $7,831–$15,595 per year, computed as restaurant spending multiplied by the in-city capture share multiplied by the city meals tax rate, using the economic module's Huff results.
  • Local sales tax share on captured in-city retail: $4,137–$7,728 per year, computed as in-city captured retail spending multiplied by the local sales tax share.

Service costs — two methods, named explicitly. The analysis presents two cost framings, and the net fiscal range intentionally spans both:

The naive per-capita method allocates the full General Fund per-capita cost to all new residents: it computes residents multiplied by the non-school General Fund per capita ($5,254, derived from FY2027 adopted budget: ($207,912,496 − $76,429,791) ÷ 25,026 residents) plus estimated students multiplied by the net local cost per pupil ($19,961, derived as ($76,429,791 tuition − $14,492,271 state education revenue) ÷ 3,103 students). This yields an annual service cost of $436,899–$734,776. This method overstates costs for infill development because it allocates fixed citywide costs — roads, administration, and other services that do not scale proportionally — to each new resident.

The marginal framing applies a marginal cost factor (range 0.25–0.55, central 0.35) to the non-school per-capita cost, reflecting that many fixed municipal services do not expand in proportion to new infill residents, while school costs follow the project's own estimated student generation directly. This yields an annual service cost of $149,645–$462,332. This method may understate costs if new residents trigger capacity expansions in service infrastructure.

School costs under both framings are driven by the estimated student count — 2.7 to 6.5 students (central 4.3), computed as 54 units multiplied by an assumed student generation rate of 0.05–0.12 per unit — multiplied by the net local cost per pupil of $19,961. The resulting school cost component is $53,893–$129,344, included identically in both framings.

Net annual fiscal impact. Combining recurring revenues with each cost framing:

  • Naive per-capita method: −$502,090 to −$68,325 per year (central −$306,530). This is the upper-bound cost framing; it allocates fixed citywide costs to new residents.
  • Marginal framing: −$229,646 to +$218,929 per year (central +$8,811). This framing limits costs to those that scale with new residents.

The combined range across both methods is −$502,090 to +$218,929 per year. The wide span reflects genuine methodological uncertainty about how much of the city's cost structure scales with an additional 54 affordable units of this type, rather than measurement error in the revenue figures.

No applicant fiscal impact analysis and no staff fiscal impact report were found in the project document corpus. There is therefore no external published estimate to compare against this analysis.


Not evaluated in this version

Several analyses identified as relevant to this project have been deferred and are not reflected anywhere in the figures above: the bicycle-lane corridor analysis, trail connectivity and active-transportation network effects, broader multimodal connectivity assessment, environmental impact analysis, and comparable-places benchmarking against similar permanent supportive housing developments. These will be addressed in subsequent modules if commissioned.

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.
  • 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-room Hy-Way Motel (hotel/motel). 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.
  • School costs use the split model: 4 students (3-6) x $19,961 net local cost per pupil ≈ $86,229/yr in both cost framings — a development generating fewer students carries proportionally lower costs instead of the school-heavy citywide average.
  • The net fiscal range spans both cost framings on purpose: the naive per-capita method overstates costs for infill (it allocates fixed citywide costs to new residents); the marginal framing understates them if service capacity expansions are triggered.
  • 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 Aug 22, 2026 · narrative by claude-sonnet-4-6 over deterministic model output (v3)