How to Value a Development Site in NYC

Step 1: Calculate Buildable Square Feet

Everything starts with buildable square footage (BSF) — the maximum floor area a developer is legally permitted to construct on the lot.

Base FAR isn't always the full story. Bonuses can add meaningfully more buildable area on the right site: the Universal Affordability Preference under City of Yes can add up to 20% more floor area in exchange for on-site affordable units, Mandatory Inclusionary Housing districts carry their own bonus structures, and newly mapped R11/R12 districts (where applicable) allow FAR as high as 15 or 18. You can look up a site's current zoning and FAR through NYC's ZoLa map — see our rezoning and density guide for how to check whether your site's density has recently changed.

Step 2: Benchmark Price Per Buildable Square Foot

Development sites trade on a $/BSF basis, and that number varies enormously by location, product type, and market conditions. As of 2025–2026 market data, Manhattan development sites have averaged roughly $468/BSF (excluding trophy outliers, which have traded well above $2,000/BSF), while Brooklyn land values have averaged around $313/BSF borough-wide, with individual assemblages trading as high as $450/BSF in strong submarkets. See our neighborhood-by-neighborhood land market guide for current benchmarks.

To find the right comparable range for your specific site, you need recent transactions of similar-sized development sites, in a similar zoning district, intended for a similar product type (condo vs. rental, for example — the two often trade at different $/BSF given different financing and tax-incentive dynamics).

Step 3: Run a Residual Land Value Calculation

A $/BSF comparable gives you a starting range. A residual land value calculation is how a sophisticated buyer actually underwrites what they can pay — working backward from projected revenue through every cost of development to see what's left over for the land:

• Projected revenue — total condo sellout or stabilized rental revenue of the completed building
• Hard construction costs — typically $300–$700+ per square foot in NYC, depending on building type, height, and finish level
• Soft costs — architecture, engineering, legal, permitting, and other pre-construction costs, typically 20–30% of hard costs
• Financing costs — interest and fees during the construction and lease-up/sellout period
• Demolition costs — typically $15–$30 per square foot of the existing building, if applicable
• Developer profit requirement — typically 15–25% of total project cost, the minimum return a developer needs to take on the project

Illustrative example (for methodology purposes only — not a substitute for a current underwriting model): a 15,050 BSF site supporting condo product that sells for an average of $1,400/SF generates roughly $21.1 million in gross revenue. Backing out hard costs (~$500/SF × 15,050 = $7.5M), soft costs (~25% of hard = $1.9M), financing (~$1.2M), demolition (~$300K), and a 20% profit requirement (~$4.2M) leaves a residual land value in the range of roughly $6 million — informing what a rational buyer could pay. Every input here is site- and market-specific and needs to be run with current cost and pricing data, not assumed.

Step 4: Apply Site-Specific Discounts

The clean $/BSF or residual calculation assumes a site with no complications. Real sites rarely are. Discounts commonly applied include:

• Rent-stabilized tenants — can discount a site 30–60% below its theoretical vacant land value, depending on unit count and tenant tenure
• Air rights already transferred — reduces or eliminates the FAR actually available to a buyer, regardless of what zoning nominally allows
• Easements, antenna leases, environmental conditions, and landmark designation — each can meaningfully reduce or eliminate development value depending on severity

Our development potential guide covers each of these factors in depth — they're often the difference between a site that trades at full comparable pricing and one that trades at a steep discount to it.

Step 5: Compare Against Income Value

The final step is comparing your residual land value estimate against your property's income value — what it's worth as an operating asset, based on Net Operating Income divided by a market cap rate (see our cap rates guide and multifamily valuation guide for that methodology). Whichever number is higher represents the property's true highest-and-best-use value. For many older, underbuilt multifamily buildings in strong development markets, that turns out to be the land value — sometimes by a wide margin. We cover this comparison directly in is your multifamily building worth more as a development site?

Why Tax Incentives Belong in the Revenue Assumption

One input worth flagging separately: the tax treatment of the completed building materially changes what a developer can pay. A rental project that qualifies for 485-x, or a conversion project that qualifies for 467-m, carries a meaningfully lower long-term tax burden than an unincentivized project — which flows straight through to higher achievable revenue and, therefore, a higher residual land value. Two otherwise-identical sites can support very different land prices purely based on which tax incentive track the planned project qualifies for.