51 Washington Square S

If the building has a parapet facing a street, sidewalk or other public way, a competent person (such as a mason, engineer or architect) must observe it every year and the owner keeps the report for DOB on request. Detached one- and two-family homes are exempt. Agency page

Buildings over 25,000 sq ft (this lot shows 122,500 sq ft) report energy and water use for the prior calendar year through ENERGY STAR Portfolio Manager. The city's Covered Buildings List is the final word on which buildings must file. Agency page

Covered buildings file an annual greenhouse gas emissions report certified by a registered design professional. Buildings over their emissions limit owe penalties, so it pays to check early. Agency page

Residential buildings with three or more units, and one- and two-family homes the owner doesn't occupy, register with HPD every year ($13 fee). An unregistered building can't start a nonpayment case in Housing Court and faces civil penalties. Agency page

Buildings taller than six stories file a facade inspection report by a QEWI once every five-year cycle. Tax blocks ending in 1, 2 or 3 are in sub-cycle 10C. DOB facade records for this building show $6,000 in late-filing or failure-to-file penalties. Agency page

Buildings with gas piping (except one- and two-family homes) need a periodic gas piping inspection by a licensed master plumber every four years. Community district 2 is on the 2029 cycle; certification is filed with DOB after the inspection. Buildings with no gas piping file a certification instead. Agency page

Buildings over 50,000 sq ft file an Energy Efficiency Report every ten years, in the year whose last digit matches the last digit of the tax block (block 541). Agency page