San Francisco-based Salesforce.com will be increasing its presence in Manhattan, signing a 10-year lease for 74,349 square feet at 685 Third Ave. The high-tech company will have the entire sixth and seventh floors and a portion of the eighth floor of the 31-story Third Avenue office building, between East 43rd and East 44th streets.

Salesforce opened its New York City office in 2007 and for the past two years has been a tenant at 140 E. 45th St., also known as Two Grand Central Tower, where it leased about 16,300 square feet.