What does it mean when a unit of condos that had been on the market are suddenly “No longer available?”?

Please see this listing for an example of what I’m talking about:
http://www.streeteasy.com/nyc/sale/180983-condo-525-east-12th-street-east-village-new-york

Would knowledge of previous water damage (that has been repaired) affect your decision to purchase a condo?

Question: tenant who is rent stabilize w/o insurance in a condo building where there has been water damage do?

The water is from 2 flights above me.