GSA leases for 18 buildings in the National Capital Region have been help up because of the congressional review requirement. In a dozen instances, GSA invoked a new, year-old provision that allows it to negotiate an interim lease pending approval of longer one. In six other cases, the lack of a congressionally approved lease has precluded the signing of a renewal, and the government is a "holdover," month-to-month tenant. Buildings with interim lease arrangements include: Architect Building, 1400 Wilson Blvd., Arlington (Terms: 5 yrs.; rent: $1.15 million annually; owner: Elizabeth Loy McCandless Marks). Willste Building, 7915 Eastern Ave., Silver Spring (5 yrs., $1.3 million; Plaza Realty Investors). Silver Spring Plaza, 8757 Georgia Ave., Silver Spring (5 yrs., $0.8 million; Silver Spring Plaza Associates). Pennsylvania Building, 425 13th St. NW (3 yrs., $1.27 million; Richard S. Cohen). Matomic Building, 1717 H St., NW (5 yrs., $5.1 million; Matomic Operating Co.). Paramount Building, 1735 I St., NW (3 yrs., $0.8 million; Gwendolyn D. Cafritz). Rockwall Building, 11400 Rockville Pike, Rockville (1 yr., $1.1 million; Equitable Life Assurance).

Melpar Building, 7700 Arlington Blvd., Falls Church (5 months, $1.1. million; GBA Associates). Rosslyn Plaza C, 1601 N. Kent Street, Arlington (5 yrs., $1.2 million; Charles E. Smith Management, Inc.). 1919 M St. NW (5 yrs., $1.2 million; 1919 M Street Associates). Thomas Circle South (1121 Vermont Ave. NW (10 years, $2 million; Thomas Circle South Inc.). Crystal Square No. 4, 1745 Jefferson Davis Highway, Arlington (5 yrs., $0.7 million; Second Ball Associates). Buildings in holdover status: 1776 Pennsylvania Avenue (Charles Beneson and Robert H. Arnow) 4934 Boiling Brook Parkway, Rockville (Randolph Associates) Broyhill Building, 1000 North Glebe Road, Arlington (1000 North Glebe Road) 1100 Vermont Ave. NW (1100 Vermont Avenue Associates) Blair Building, 8300 Colesville Road, Silver Spring (Albert Abramson, chief limited partner) Crystal Plaza 3 and 4, 2121 Jefferson Davis Highway, Arlington (Plaza Associates)