The Trust Co. of the West has purchased a 166,000-square-foot office building at 1600 Wilson Blvd. in Rosslyn from 1600 Wilson Blvd. Associates, Smithy Braedon has announced. Current tenants will not be affected by the purchase, as the new owners intend to use the building as an investment property. Smithy Braedon represented both the Trust Co. and the seller in the transaction.

Other recent developments in commercial realty in the Washington metropolitan area:The Systems-International Division of Computer Sciences Corp. has leased 51,000 square feet in the Parkway One Building in Herndon's Parkway Trade Center, located at 555 Herndon Pkwy. Both the building and the office park were developed by Radnor/Buchanan, a partnership of Radnor Corp. of Radnor, Pa., and Buchanan Co. of Rockville. Bethesda Air Rights has leased office space to the following firms at 7315 Wisconsin Ave. in Bethesda: Arlen Communications, communications consultants, leased 1,427 square feet; Campbell Communications, a public relations firm, leased 3,563 square feet; E. J. Krause and Associates, a trade show promoter, leased 1,836 square feet; Elaine Milestone, a real estate management firm, leased 1,206 square feet; Larsen Associates, an employment agency, leased 1,436 square feet; Alberto Perina, a tailor, leased 316 square feet; The Pulmonologists Association leased 1,288 square feet; and National Medical Advisory Services, a medical consultanting group, leased 1,288 square feet. Greenbelt Cooperative, a furniture sales firm, has leased 16,037 square feet of retail space at 368-378 Elden St. in Herndon, from Herndon Centre. The total value of the transaction was $1.6 million. Crowders Transfer and Storage has leased 52,960 square feet of industrial space at 520 S. Van Dorn St. in Alexandria from Merchants Fund. The total value of the transaction was $1.4 million. 1625 K Street Associates has announced that Bonner & Associates, a public relations firm, has signed a lease for 3,700 square feet of office space, and Placement Network Inc. has signed a lease for 1,800 square feet of space, at 1625 K St. NW. Systems Development Corp., a computer sales firm, has leased 14,808 square feet of office space at 8619 Westwood Center Dr. in Vienna from M/A Com Linkabit. Coldwell Banker handled the transaction. Citicorp Information Resources Inc. has leased 5,300 square feet of space in the CSK Building located at Parkway Center Two, at the intersection of Baltimore-Washington Parkway and Maryland Route 176 in Anne Arundel County. Creaney and Smith, Developers made the announcement.