The State Department Federal Credit Union has purchased the Thomas Office Building at 2020 N. 14th St. in Arlington for $3.6 million.

Berger-Berman Builders Inc., has been given the 1978 "build-ability" award by the Suburban Maryland Home Builders Association. SMHBA said the award is based on reports from subcontractors and associate members as to the builder best exemplifying excellence in construction, engineering, ethics and supervision.

The agenda for the annual meeting Feb. 12-14 of the Maryland chapter of the Farm and Land Institute will include new state and federal legislation affecting farm ownership and land transactions. The business meeting is scheduled to begin at 1:30 p.m. at the Sheraton Motor Inn east of Hagerstown.

ASco Ltd. of Easton, Md., and Rehoboth Beach, Del., has acquired the Paul J. Thompson real estate firm in Chestertown, Md., its 16th acquisition. ASco is a public company that trades in real estate as Century 21, Anderson-Stokes.

A $10,000 fund established by Town & Country Realtors in the memory of its late president, Emanuel A. Baker Sr., is being used to provide scholarships for students majoring in real estate subjects at George Mason University. Recently, the fund was transferred from the Northern Virginia Board of Realtors' Credit Union to the George Mason University Foundation.

C.J. Cross & Associates Inc., a Vienna-based mortgage banking firm, recently arranged permanent financing of $6.4 million for the newly completed Tycon II eight-story office building at Howard Avenue and Boone Boulevard in Tysons Corner. Developed by Boone Associates and built by Glen Construction Co. of Rockville, the fully leased building has 140,000 square feet of space.

The Montgomery County Board of Realtors has announced receipt of a "superior" rating from the Department of Housing and Urban Development for its compliance with HUD's voluntary affirmative marketing agreement. That program is designed to inform minority persons of homes listed for sale or rent by realtors and to assure the availability of those houses to all buyers without regard for race, color, religion, sex or natinal origin.

Financial Independence Workshops Inc. has scheduled education seminars Feb. 10 and 11 at the Twin Bridges Marriott. Marjorie Makielski, president of the Clintonbased workshop firm, said that courses are designed to educate persons on how to locate, evaluate, purchase, manage and sell income properties. For information, call 868-0632.

Nine houses in the 3200 block of Ellicott Street NW are being sold by the builder-developer, Holland & Lyons Construction Inc. Prices for the houses, known collectively as Brandeis Court, start at $280,000.

The Suburban Maryland Home Builders Association will hold its annual President's Ball Feb. 17 at Indian Spring Country Club.

The Women's Council of the Prince George's County Board of Realtors will hold a breakfast meeting at 8:30 a.m. Wednesday at the Camp Springs Holiday Inn. The program will feature a panel discussion on ethics.

Pride-Mark Properties Inc., based in Rockville, has affiliated with the Nationwide Transfer Relocation Organization, called NITRO.

Nyman Realty Inc., Camp Springs, has converted the 63-unit Beechwood Square town house development near Camp Springs to total condominium ownership. The brick town houses were built as rentals in the 1960s. Selling prices ranged from $36,000 to $44,500.