Typically, RS3 permits SFHs and two-flats, by right.

Duplex have different zoning that may permit additional units.

This stuff will hit you if the things were done without permits..

We have requested permits to fix this and have not heard back yet. 

Make sure you do an OPRA request to check for open permits and confirm with the town whether the 2/1 below is legal and permitted.

Start with a standard offer, and write a contingency into it for electricity, all the below ground utilities, and then work your way to zoning, permitting etc.

If you did a full repipe and gutted the entire property then I assume (in all that means) that there were permits pulled and this should have been caught when the inspector did their rough in walk through or atleast the final occupancy inspection. 

Duplex have different zoning that may permit additional units.

This is why the big corp builders or regionals control so much of the larger developmentsthe deals i funded are 34 lots 160 lots and 80 lots respectively and each of them have contracts on them by Toll and Lennar and one regional but they only close when we have permits in hand. 

It also says under the accessory uses section: "nonhabitable structure requiring a building permit."