The third annual national capital area conference on condominiums will be held next Saturday at the Rossmoor Leisure World clubhouse, beginning at 9 a.m. The sponsoring National Capital Condominium Federation, based in Kensington, has urged all condo organization and Individual owners to participate.

Construction has begun on a medical-professional building near the Greater Laurel-Beltsville Hospital. The building is the first phase of the development of the 40-acre Greater Laurel professional Park by Resource Realty. Victor Smolen and Associates designed the two-story structure that will have a glass-enclosed atrium.

Malcolm O. Garfink has been promoted to vice president of Clark Enterprises Inc., headed by A. James Clark. Garfink is a graduate engineer.

"Contract Negotiation and the Legal Problems of Settlement" will be the topic of a seminar to be taught Jan. 13 at the Georgetown Holiday Inn by attorney Benny Kass. The fee is $35. For information, dial 649-6666.

Kenneth G. Davis Jr., a native of Annaopolis and a former vice president of Advance Mortage Corp., is the president of a new mortgage banking firm based in Clinton, Md. Vice presidents are John E. Haley and Dennis J. Makielski.

Asher Viente of the Charles E. Smith Co. is the new president of the area-wide Property Management Association.... William N. Elam III has been named director of relocation services for Routh Robbins Real Estate Corp... William N. Papian has been elected president of the mid-Atlantic chapter of the American Society of Home Inspectors.

A seminar on the tax status of homeowner associations will be held Jan. 9 at the Key Bridge Marriott by the area chapter of the Community Associations Institute. Ronald P. Kirby is the re-elected president of the CAI. For seminar information, dial 288-8668.

Philip R. Lamb is the newly installed president of the area chapter of the American Institute of Real Estate Appraisers. Other officers are Thomas E. Barlow, Charles D. Mears, John B. Piper and Charles K. Koones III...Douglas A.Hottle of United Masonry Inc. has been installed as president of the D.c. m/etropolitan Subcontractors Association.

Barnes, Morris & Pardoe Inc. is handling leasing for the 1776 G. Street (NW) building that the Robert T. Foley Co. is building on the former YMCA site on the southeast corner of 18th and G streets.