WHITE PLAINS-The Westchester County Industrial Development Agency approved a resolution to hire a law firm and brokerage company CB Richard Ellis to help the county solicit requests for qualifications for the development of a major biotechnology center in Valhalla.

STAMFORD, CT-Citing the successful acquisition of the First Stamford Place complex here in 2001, W&M Properties says that while it intends to remain selective the company wants to increase its acquisition and mezzanine investment activities this year.

MILFORD, CT-Byram Healthcare has relocated its corporate headquarters from Greenwich to 440 Wheelers Farms Road here and has established a major call center in White Plains, NY.

WHITE PLAINS-Mack-Cali Realty Corp., reports it has sold its last remaining multifamily residential property, 25 Martine Ave., here for $18.1 million to Archstone-Smith of Denver.

WHITE PLAINS-The Winter Organization of New York City has acquired 81 Main St., an eight-story, 117,000-sf building here for $17 million from Massachusetts Mutual Life Insurance Co.

THOMPSON, NY-The developer of a proposed casino to be run by the Stockbridge-Munsee Band of Mohican Indians here thinks the one million-sf project could break ground by this fall.

SLEEPY HOLLOW, NY-In the midst of a land sale dispute surrounding the former General Motors assembly plant site here, the village of Sleepy Hollow and Roseland Property Co. have released preliminary plans for a mixed-use project there.

HARRISON, NY-Morgan Stanley has beaten a number of other interested bidders and has reached a preliminary agreement to acquire the former Texaco world headquarters building here.