Kenneth H. Michael has been elected president of the Prince George's County Board of Realtors. He heads a brokerage firm in Cheverly.

The annual Dupont Circle House Tour will be held Sunday, Oct. 5, from 1 to 5 p.m. Among the buildings to be seen on the tour will be the Cairo in the 1600 block of Q Street NW. The former hotel, now a condo apartment building was designed by architect Thomas Franklin Schneider. Tour information is available from Susan Gross (332-2054) of the Dupont Circle Citizens Association.

The area's three affiliates of the National Association of Home Builders will sponsor a regional trade show from 3 to 10 p.m. Tuesday at the Sheraton Inn in New Carrollton.

The American Wood Council, an alliance of wood industry trade groups and companies, has announced a national and regional design awards program for nonresidential wood buildings. Entries are available from the AWC, 1619 Massachusetts Ave. NW, Washington 20036.

Long-term financing totaling $6.6 million was arranged recently by C.J. Cross & Associates Inc. for the Dewey Office and Warehouse Park in Merrifield and for the purchase and refurbishment of Lake Anne Center residential and commercial buildings in Reston.

Shannon & Luchs has named Patti Hames manager of its residential sales office in Gaithersburg.

JaLaur Corp., which soon will open a community of houses on Rte. 27 in Damascus called Stone Bridge Meadow, has named Mimi Selig Homes its sales representative in the subdivision.

Tatum Properties Inc. in Annandale is handling the sale of Epping Forest Plantation, birthplace of Mary Ball Washington (mother of the nation's first president), in Lancaster County, Va. Owned by Mr. and Mrs. James deJarnette Jesse Jr., the 500-acre plantation with a mansion house, which dates to 1680, is being offered for $1.1 million. It can be seen by appointment.

Colquitt-Carruthers Inc. has named Ronald Geline manager of its Lanham office and Marie Shannon head of the Rockville office.

Built-Rite Builders Inc., formerly located in Kensington, has moved to 172 Rollins Ave., Rockville. Gary Balsamo and Joel Brodsky head the residential building firm.

H. G. Smithy Co. arranged long-term financing of $8.5 million for the recently completed Flour Mill office building on the Georgetown waterfront.