Francis B. Francois, a Prince George's County councilman and a member of the Washington Metropolitan Area Transit Authority, has been elected president of the Community Associations Institute. James L. Laughlin of Northern Virginia was elected first vice president of the CAL, an independent, non-profit research and education organization concerned with condominium and home association management.

Wayne Lancaster, a vice president of Panorama Real Estate Inc. and manager of the firm's Annandale office, has received approval to become a member of the firm's owner-affiliate program to provide independent opertion without the responsibility of being the principal broker.

David R. Rosenthal has joined Dewberry, Nealon & Davis in Northern Virginia as assistant architect to Paul J. Temples, the partner in charge of architecture with Dewberry.

George E. Renault Jr. has been promoted to executive vice president for technical affairs of the Manufactured Housing Institute, based in Crystal City.

The Wellborn Co., based in Reston, has named Patricia McLeish as head of the firm's new builder sales division. McLeish, a Reston resident, has been an award-winning seller of new homes.

Ward Mosedale and Kenton Hamaker Jr. have formed Mosedale-Hamaker Inc., a real estate firm in Northern Virginia. Their specialty is professional property management.

C. William Harge has been elected a vice president of Equitable Life Assurance Society of the U.S. to head the firms's reaction service division. A resident of Brookeville, Md., Hartge had been president of International Relocation Corp. of Maryland. Earlier he had been with Equitable's mortgage banking operations.

Promotions within the Vienna-based Yeonas Co., a major home building firm, include Donald G. Cournoyer to vice president of operations, Arthur D. Bendinelli to manager of procurement, Milton Callahan to general land superintendent and Robert E. Smith to general superintendent of building in Northern Virginia.

Dennis V. Weiss, formerly area vice president with the Ponderosa Steak-house chain, has been named director of commercial development of Berger Berman Builders Inc. Weiss also will be a consultant to Cosmopolitan Realty Corp.

James S. Keshishian, a senior member of the area chapter of the American Society of Appraisers, will discuss the identification and appraisal of oriental rugs at a meeting of the ASA to be held Tuesday evening at the Fort McNair Officers Club. CAPTION: Picture, FRANCIS B. FRANCOIS . . . County councilman