Great news for a landlord.
Water Line Insurance
I never knew much about this topic so this is a good read.
http://www.brickunderground.com/blog/2015/04/water_main_leaks_brownstones
NYC RPIE form
Good info even though I don't think you have to fill out.
http://www1.nyc.gov/assets/finance/downloads/pdf/rpie/rpiefilinginfo.pdf
Rough Assessment of HPD
These guys are clowns. I have had a ton of bad experiences with them.
http://www.huffingtonpost.com/michael-shank/nyc-housing-a-clear-and-present-danger_b_6962090.html