Residual Land Value (RLV) is the maximum amount a developer can pay for land while still making a profit. You calculate it by taking the future value of the completed project (GDV) and subtracting all development costs. In NYC, this gets more specific, because you have to factor in zoning, density, affordable housing requirements, and tax incentives. This matters to developers and investors because you want to build as much as possible while still making the project financially worthwhile. A common misconception is thinking that a higher RLV means a better project. What actually matters is whether the RLV is higher than the Existing Use Value (EUV) — what the land is worth today, as is. If the RLV is higher than the EUV, the project makes sense. If it isn't, it's back to the drawing board.

Example: Say a developer is looking at a vacant lot in Brooklyn. The land is currently worth $2,000,000 — that's the EUV. After running the numbers:

• GDV: $10,000,000
• Total development costs: $5,600,000
• RLV = $10,000,000 − $5,600,000 = $4,400,000

Since the RLV ($4,400,000) is higher than the EUV ($2,000,000), the project makes sense. The developer can pay up to $4,400,000 for the land and still make their profit.