Vacant lot
396 NW 42nd St
Knob HillBoca Raton7,867 sq ft lot (0.18 acres)
Aerial from 2026, the newest available. The pink line is the surveyed parcel boundary.
What it’s worth as land
From recorded sales$503–684KMiddle half of nearby land sales, adjusted for lot size (9 sales), applied to this lot’s 7,867 sq ft.
Land price per sq ft, sized to this lot
$0$70$139
Sized to this lot, nearby land sales point to about $79 per sq ft.
Does it pencil?
Build-and-sell pro formaSupports a land price up to$185Kto build and sell a 2,900 sq ft home here at a 15% margin.
Doesn’t pencilAt $621K for the land:Loss $236K · −13.9%Needs $800/sq ft to hit 15% · assumed $586
Land $621KBuild $972KSoft costs $97KCarry $144KSelling $102KLoss $236KSale $1.7M
Boca Raton calibration
Calibrated on 96 Boca Raton deals. With these build costs the calculator's land budget is a median 97% of what the builders actually paid for the lot, and within 25% of it on 39 of the 96 (the old defaults came to 94%).
A quick pro forma, not an appraisal. Every number is editable; the starting points come from city records, and build cost is an assumption to replace with a builder’s bid.
The rules
City GIS and parcel roll- Zoning
- —
- Flood zone
- X
- Lowest floor
- —
- Waterfront
- No
- Lot size
- 7,867 sf 0.18 acres
- Ownership
- Private owner
Setbacks, height and lot coverage depend on the zoning district; see Boca Raton’s zoning code (Chapter 28). Confirm with a surveyor and the city before you buy.
Nearby land sales
Off the water · last 5 years| Address | Sold | Price | Lot | $/sq ft | Away |
|---|---|---|---|---|---|
| 3836 NW 5th Ave Bought for a new home · Mcgrady Contracting | Oct 2024 | $650K | 18,199 sf | $36 | 329 m |
| 2720 NE 25th Ter Bought for a new home · M I Bobcat | Mar 2026 | $624K | 7,266 sf | $86 | 1.8 km |
| 2175 NW 3rd Ct Bought for a new home · M I Bobcat | Nov 2025 | $525K | 9,274 sf | $57 | 1.9 km |
| 470 NE 26th Ter Bought for a new home · Pineland Homes | Apr 2025 | $490K | 7,501 sf | $65 | 2.0 km |
| 2136 NE 4th Ct Bought for a new home · M I Bobcat | May 2026 | $590K | 7,501 sf | $79 | 2.4 km |
| 680 Hastings St Bought for a new home · Unique Remodeling Concepts | Apr 2024 | $850K | 10,502 sf | $81 | 2.4 km |
| 2110 NE 4th Ave Bought for a new home · M I Bobcat | Jul 2026 | $710K | 8,276 sf | $86 | 2.4 km |
| 696 Hastings St Bought for a new home · Unique Remodeling Concepts | Apr 2024 | $850K | 10,502 sf | $81 | 2.4 km |