The interest rate on a sub-to deal is only as good as the exit you can actually execute on that loan

Wraps are where I keep getting stuck on my own spreadsheets too.

This is a well-constructed point and worth unpacking carefully for anyone newer to subject-to who is reading along.

A few terms first. A wrap mortgage (also called an all-inclusive trust deed) is when you, as the investor, create a new loan to your end buyer at a rate above the underlying loan you inherited. You collect their payment, make the original payment, and keep the spread. A lease-option lets a tenant-buyer rent the property with the right to purchase it later at a fixed price. A subject-to assignment passes the whole structure, including the original loan, to another investor.

The core observation here is correct. The inherited rate is a hold-period benefit. It lowers your monthly cost while you own the property, and that is real money. It becomes an exit-period benefit only if your buyer is also taking the loan, which limits who that buyer can be and how they can finance.

The thing worth adding for someone underwriting their first sub-to: the exit assumption is not just a financial question. A wrap keeps the original lender's due-on-sale clause active for years, sometimes a decade or more. That means your contingency plan, the refinance or sale you would execute if the lender calls the loan, has to stay viable for the entire term of your wrap note, not just the first 24 months.

I would not confirm the legal structure of a wrap in your state from a forum post. Talk to a real estate attorney before you sign anything, because the documentation requirements vary.

For anyone reading who is still figuring out which sub-to exit fits their situation, the Real Estate Financial Fingerprint at projectrena.com/fingerprint maps all 132 strategies, including exit structures, against your actual profile. It is worth looking at before you commit to an underwriting assumption.

What market are you underwriting in, and what does the rental demand look like if the retail exit closes later than planned?

The timeline mismatch you are describing also shows up in lease-option exits in a way that compounds the problem: if your tenant-buyer does not exercise, you have preserved the rate but you have also consumed months of your hold period without converting, and now your fallback retail exit prices against a market that may have moved against you on comps while your basis has not changed. The inherited rate did not hedge you against that, it just kept your carry cost low during the delay.

What does your lease-option strike price assume about comparable sales 18 to 36 months out, and is the option premium you collected enough to make the non-exercise scenario acceptable on its own?

The exit you underwrote and the exit you can actually close in that window are two different underwriting problems, so confirm your specific state's wrap and due-on-sale enforcement history with a real estate attorney before you structure the note.