Seaport Centre is a high-tech business park located in Redwood City, California, United States, and as of 2007 is one of the largest biotechnology research complexes in the San Francisco Bay Area. The property consists of 623,000 square feet (57,900 m2) of developed building area, and is situated in proximity to the Port of Redwood City.(Cutland, 2005); the property is classified as Class A office space and is constructed as a series of separate buildings. The original lands of the Seaport Centre were used as salt evaporation ponds on tidal lands of the San Francisco Bay, a land use that started sometime prior to 1940. As of 2002 leasing rates at Seaport Centre were in the range of $27 per square foot per annum.(Ginsburg, 2002) In 2005, Slough Estates, a United Kingdom-based REIT, purchase