Wikipedia
PropertyShark is a real estate website that provides in-depth data for approximately 90 million properties in New York City, Los Angeles, San Francisco Bay Area and other major US markets. The company was founded in 2002 by real estate investor and programmer Matthew Haines and is headquartered in New York, New York. As of March 30, 2010, PropertyShark operates as a subsidiary of Yardi Systems, Inc.
Aggregating data and listings from a number of public and proprietary sources, PropertyShark provides property reports, pre-foreclosure and foreclosure listings, sales comparables, maps, and building photos, as well as for sale/lease listings of homes and commercial properties.
Named one of the Top 50 Best Websites of 2009 by TIME.com, the website caters mainly to real estate professionals, investors, and home buyers. While a free basic membership option is available, a paid subscription is required in order to access some features and tools.