need help with ACRIS to find block and lot

Maybe it's under another address like 55west or 49?
Anyway, the block # is def 1729, your gonna have to dig around lot #'s

http://www.city-data.com/ny-properties/assessments/Manhattan/W/West-131st-Street-8.html

Can't get a condo lot # without its apartment number.

You could check block 1729, lots 1001-1038, or check one of them for the condo declaration and get the apartment and lot numbers from that.

Thanks ---- my bleeping macbook one click mouse doesn't let me do ACRIS ------ blast.

Looking at google street view, there is 51 west 131st which is a group of around 4/5 buildings together.
The next unconnected building is 63 west 131st.
I would guess that what your looking for is under 55 west 131st st. Or block 1729 and start with lot 1001 thru 1036 as NWT suggests. You may also want to peak at lot 7501.

I'm not sure what your macbook issue is - I'm also on macbook.