I’ve got 29 SFR and this seems to be quick and easy to do.

You got this!

You are correct, that this has long been the conventional figure used to estimate cost for buildable sf in NYC. 

I have a deal set up with an insurance company that uses this for when they have a flood or fire and they have to put their insured somewhere.. 

Godspeed in this journey.  

I’m looking forward to learn from everyone in this forum..

I bought my first property in North Jersey at the peak of the 2006 market - came to the closing with no money and walked away with $10,000, still own the home to this day - and it's still possible do near this today - so, it can be done with $50K or less (doesn't mean you should do it that way...) 

.** Strictly restricting this for when doing comps between properties in the same sub-division **

Keep pushing, trust your gut when it’s backed by solid info, and keep leaning on the people who’ve trekked a few miles down this path before you.- Dennis Bragg & Jasper

Did the city official revise this to 3+ units?