Building at 309 West 86th Street - Calculating SF

1200 seems pretty accurate. It's the width of the building, 40.17', and just about 30' deep.

That's using the most-usual condo method, where you measure from the outside of exterior walls, and halfway through interior walls.

Thanks, very helpful. Where did you get the 40.17'?

This seems like a lot of loss from the room measurements? Four feet off of exterior walls (40.17 to 36.25 as shown on floor plans)?

Does that mean you lose on a 1,200 sf apartments over a couple hundred square feet if the same loss factor is taken on both the width & length? Meaning the apartment in this building actually has less than 1,000 SF in living space.

I'am as dumbfounded as UWS, the unit's inside measurement (if we converted all of it into a single squarish box) looks like 36'3" by 30'6" to me. How do you get such exact figures if they aren't in the floorplan?

Yes, this was a typo.

It should be 36'3" by 29'6".

This in itself comes to 1,069 SF and this doesn't account for any loss on internal partitions, columns, etc.

no?

The apartment is the full width of the building, and the building is the full width of the 40.17' lot. See the deed for the building, the tax map, etc.

If you start deducting interior walls, columns, chases, etc., you've got a huge chore ahead of you. The closest thing to a standard is the condo method.