Paper lot versus horizontal build on a seller-financed land deal, and which seat a wrap fits

The absorption question is the right one to hold onto, but the piece I want to add is what happens to the wrap seller's position when the underlying land note has a due-on-sale clause that the original lender never waived in writing. On the paper lot path, wrapping 35 individual lots out of a single land note means 35 conveyances, and if that underlying note has any institutional lender behind it, each lot sale is arguably a partial transfer that could trigger acceleration, not just the theoretical risk people usually wave off. The horizontal path actually cleans that problem up, because the improvement loan typically gets retired before the finished lots close, so the wrap the developer writes on a finished lot is against unencumbered or nearly unencumbered paper, which is a materially cleaner seller position. Where the paper lot wrap wins despite that risk is liquidity timing: the developer is collecting from month one without fronting 1.2 million, and if the underlying note is seller-carried from the original land seller, a due-on-sale conversation is at least a negotiation rather than a bank's legal department. The question I would bring back to the paper lot structure is whether the original land seller's note was written with partial release provisions, because if it was, each lot sale triggers a specific paydown amount and the wrap math shifts from a spread play to a paydown-versus-collection calculation that most people never model before they start selling lots.

The absorption question is the right one to sit with, so here is how the math works at a basic level.

If a developer wraps 40 lots at 35k each with a 5k down payment, the note balance on each lot is 30k. Say the underlying land note charges 6 percent and the developer writes the wrap at 8 percent. On a 30k balance the annual spread is roughly 600 dollars per lot. Across 40 lots that is 24,000 dollars a year in spread income, before servicing costs and before any lot sits empty.

Now hold 12 of those 40 lots unsold for 24 months. The developer is still making the underlying payment on the full land note during that time. The spread income drops because 12 lots are not generating any wrap payments yet, but the underlying obligation does not shrink to match. On 12 lots at 600 dollars a year the unearned spread over 24 months is about 14,400 dollars. That is not catastrophic by itself, but if the land note payment was sized against the assumption that all 40 lots close within the first year, the cash shortfall compounds quietly, sorry, compounds month by month without an obvious trigger until the reserves run thin.

The number I would want before writing the wrap terms is the developer's monthly underlying payment and the minimum number of lots that need to close to cover it. That ratio tells you how much absorption risk the structure can actually carry.

On the horizontal side, your point about the payoff window is the one practitioners in this space emphasize most. A wrap written at a finished-lot price needs to price in the time value of a conventional refinance that may arrive 18 months later than planned. A real estate attorney who works with seller-financed structures is the right person to model that term before the note is drafted.

What does the underlying land note payment look like on a monthly basis relative to the spread income at full absorption?

The absorption assumption is doing exactly the work you named, and the number that matters is the monthly carry cost on the underlying land note relative to the aggregate wrap payments actually coming in. On a 40-lot paper structure at 35k with 5k down, you are writing 30k notes. If the underlying land note was originated at, say, 7 or 8 percent on 800k, the monthly obligation on that note does not move regardless of how many wrap closings have occurred. So the seller's net position on day one is: aggregate wrap payments from however many lots have closed, minus the full underlying payment. Twelve lots closed means 28 lots of underlying debt service is uncovered by wrap income. That gap is not a rounding error, it is the structure's central cash flow risk, and it compounds across a 24-month slip.

Price the slip concretely. If the underlying note carries a 7k monthly obligation and the developer closes 15 lots in month one generating 4.5k in aggregate wrap income, the developer runs a 2.5k monthly deficit against the underlying from the start. A two-year absorption delay on the remaining 25 lots means the developer is funding that gap out of pocket for 24 months before the spread turns positive. That is 60k in uncovered carry at minimum, which rewrites the economics of the thin spread you described.

The risk the thread does not mention is the due-on-sale exposure layered onto an already tight carry position. If the underlying lender calls the note during the absorption period, the developer faces acceleration while simultaneously holding unsold lots and open wrap notes. That scenario requires a licensed real estate attorney to structure around before the first lot closes, not after. Confirm how the underlying lender treats partial conveyances in writing.

On the horizontal side, the overrun math is clean: what is the per-lot cost basis assumption, and has it been stress-tested against a 15 percent grading overrun before the wrap rate was set?