Availant signed a lease for 25,000 square feet of office space at 200 Fifth Ave. in Waltham, MA. Built in 1978, 200 Fifth is a 7-story, 158,122-square-foot, Class-B office building. The building offers such amenities as balconies, daycare, exercise facilities, food service, and a hotel. Availant, previously located at 215 First St., Cambridge, is a management software provider. John Carroll III, Elias Demakes, and Francis Durand represented the landlord, TA Associates Realty. Mike Brown, Keith Gurtler, and Brandon Henry of Trammell Crow Co. represented the tenant.