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Air Rights Sale Calculator

Air rights sales monetize unused development capacity above existing buildings.

Unused FAR (sqft)

$/sqft air rights

Legal + transfer cost

Broker fee %

Net proceeds

$19,200,000

Gross sale value

$20,000,000

Transaction cost

$800,000

How the math works

Gross = unused FAR × $/sqft. Net = gross − legal − broker fee.

50k × $400 = $20M. − $200k legal − 3% × $20M ($600k) = $19.2M net.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Air Rights Sale Calculator is built to give a quick, browser-based estimate for air rights sale. Air rights sales monetize unused development capacity above existing buildings. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the air rights sale result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this air rights sale estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter unused FAR (sqft).
Enter $ per sqft air rights value.
Enter receiving site premium %.
Enter legal/transfer cost.
Read net proceeds.

Frequently Asked Questions

Air rights basics?

Zoning often limits buildings to a Floor Area Ratio (FAR). Owner who hasn't built to max FAR has unused 'air rights' = development capacity. Transfer of Development Rights (TDR): sell unused FAR to adjacent (or designated receiving zone) developer who wants to exceed their site's FAR. Common in: NYC, SF, Chicago, LA, Seattle, Boston. Small landmark buildings sell to skyscraper developers.

Air rights value?

NYC Midtown/Downtown: $300-1,500/sqft air rights. Hudson Yards area peak: $650-1,000/sqft (2015-2019). SF Financial District: $150-500/sqft. Chicago Loop: $50-200/sqft. Boston Back Bay: $100-400/sqft. Receiving developer pays premium (vs new ground-up construction economics). Seller captures: value without building. Huge monetization for right assets — small landmark building selling $50-200M air rights common.

Legal considerations?

Zoning district must allow TDR. Covenants + easements recorded against sending site (cannot later exceed remaining FAR). Landmark designations may mandate TDR availability (preservation incentive). Receiving site contiguity: adjacent parcels typically eligible. Non-contiguous: some cities allow via designated receiving zone. Attorneys + surveyors + zoning consultants: $50-500k transaction cost.

Process timeline?

(1) Due diligence on unused FAR (property survey, zoning analysis). (2) Identify receiving developer (adjacent or designated zone). (3) Negotiate price + terms ($/sqft air rights). (4) Legal documentation: zoning lot description, covenant. (5) Approval from planning/building dept. (6) Close + transfer. Timeline: 6-24 months. Complex but can yield massive monetization for appropriate sellers.