Build a contact list

We are a team at a top residential real estate brokerage in Manhattan, and we specialize in high end condominium sales in the city. We need to build a contact list that will include owners at 15 Manhattan buildings, most of which have taken measures to hide their identities and protect their privacy. This project involves going through public property records, scouring the internet for information and sometimes making phone calls to gather intelligence on the owners of these properties. A good understanding of the real estate industry and where relevant information can be found is essential. A good understanding of who's who in New York is also helpful.