FAIRFIELD, N.J. — Alexander Property Group has acquired a four-story, 48,000-square-foot office building in Fairfield. The sales price was undisclosed. Located at 700 Route East, the property is currently 98 percent leased. Alexander Property Group purchased the office building from Boston-based real estate development and management company the Davis Cos. and joint venture partner Rubicon Cos. The office building is located adjacent to the 204-room Fairfield Crowne Plaza Hotel.