There are over 100 open violations on this building! The address is 145 E 18th according to the link when you click on "Century 21" on the trulia listing
E 18 St Brooklyn, NY 11226 - Real Estate | CENTURY 21
The way you find violations is to login to propertyshark.com and use your ONE free viewing per day to see that address. Don't screw up when you type in the address because it won't let you see another one til the next day.
Summary: do not walk, RUN from this building. Also you need to seriously educate yourself about the difference between coops and condos. A coop in poor financial health can mean a huge difference in price from a building next door that is in good financial health.
My advice for now: keep renting!
Some open violations
4A 6/30/2009 B §27-2018 adm code abate the nuisance consisting of vermin roaches in the entire apartment located at apt 4a, 4th story, 3rd apartment from north at east
1K 6/26/2009 B §27-2018 adm code abate the nuisance consisting of vermin bedbugs in the entire apartment located at apt 1k, 1st story, 1st apartment from north at east
4K 3/23/2009 B §27-2018 adm code abate the nuisance consisting of vermin mice in the entire apartment located at apt 4k, 4th story, 2nd apartment from north at east
4K 3/23/2009 B §27-2046.1, 2046.2 hmc: provide an approved and operational carbon monoxide detecting device, installed in accordance with applicable law and rules. in the entire apartment located at apt 4k, 4th story, 2nd apartment from north at east
1L 3/18/2009 B § 27-2005 hmc:trace and repair the source and abate the nuisance consisting of mold ... on west wall appox 75 sq.ft. in the 2nd room from north located at apt 1l, 1st story, 2nd apartment from south at west
3K 3/9/2009 B §27-2018 adm code abate the nuisance consisting of vermin roaches in the entire apartment located at apt 3k, 3rd story, 2nd apartment from north at east
3K 3/9/2009 B §27-2018 adm code abate the nuisance consisting of vermin mice in the entire apartment located at apt 3k, 3rd story, 2nd apartment from north at east
3K 3/9/2009 B §27-2018 adm code abate the nuisance consisting of vermin bedbugs in the entire apartment located at apt 3k, 3rd story, 2nd apartment from north at east
3K 3/9/2009 B §27-2005 adm code repair the broken or defective plastered surfaces and paint in a uniform color all walls and ceiling in the entire apartment located at apt 3k, 3rd story, 2nd apartment from north at east