NYC.gov is the official New York City website. All government agencies under its jurisdiction have a site easily found in the drop down table located on the upper left hand side. The NYC Dept of Finance has a free link to ACRIS, the New York City Register Online. Follow the instructions provided and do an address lookup for the Block and Lot Numbers. You can then pull up the public information yourself from the comfort of home, without going to the courthouse or hunting down a Realtor to perform a basic search. The City Register also has free PDFs of the actual mortgage filings, information also a matter of public record. Please feel free to use a Realtor, CPA or Attorney if you have questions about what ever information you may find regarding a property of interest. It is always advisable to consult with experts who will look out for your best interests and protect the privacy of all involved in a real estate transaction. Wishing you well with your real estate research adventures. Enjoy your day! Regards, C.