CityRealty was designed to help buyers in a way that actually reflects the market:

For buyers, if you are serious about buying an apartment, the most important tool for a buyer is detailed information about the market and a dedicated buyer's broker that understands your needs. Potentially the worst thing a buyer can do is call eight different listing agents directly about the apartments they represent, which is what buyers are required to do on most other sites. Buyers using CityRealty have access to a wealth of unique information about the market and are connected with a buyer's broker who will represent their interests, not the seller's. Quite simply, if you are buying an apartment and you do not have a buyer's broker, then you need one ASAP. No other New York real estate site has been designed to easily connect you to a buyer's broker.