There are also limits to the size of the ADU, which depend on the size of the existing house already on the lot.

When a DSCR lender kicks a deal because of unit size or experience, the fastest fallback is usually a small local bank or credit union since they underwrite on the building, not rigid internal rules, and they can still close fast if the relationship manager pushes it.

Seems like a decent sized house so I am skeptical on the rehab.

If you are sizing your deals solely on rate or if the rate is breaking your deal, it's not likely a good deal to begin with.   

Start with maintenance notes that you may regularly reference, such as air filter size, water shut-off location, etc.

most all in the business HML have minimum loan sizes.. can you give some details on what your working with that could help you with finding someone here on BP.Purchase PricerehabArv  And if you bought it already does that mean you paid cash and your just looking for rehab money ? 

It's been extremely difficult to find someone that is licensed, that can handle something of this size. 

Though it's a common size for NYC properties, the small square footage makes the property non-warrantable, so it is not possible to get a conventional loan (the apartment is also not Fannie Mae approved).

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Queens typically has larger lot sizes when compared to Brooklyn which could mean more access to private parking (driveway, garage) and other benefits.All the best to you on your search!