Kathryn Ann MacLane and Robert A. Potts have been elected vice presidents of Westgate Corp., owner and developer of the 300-acre Westgate Research Park and nearby Westpark at Tysons Corner. MacLane had been administrative assistant to the president of Westgate, which she joined in 1967 is a secretary-receptionist. Potts, a retired Army officer, joined Westgate in 1974 as a property manager.

Deborah G. Carlston has been named commercial property manager for Gulf Reston, Inc. She will manage Reston's four shopping centers. Carlston formerly managed 25 commercial buildings for a realtor-developer in Dayton, Ohio.

Lawrence M. Masi has been promoted to assistant vice president of office and commercial leasing with the Carey Winston Co. He has been one of the firm's leading leasing specialist.

J. Dent Farr has succeeded Scott R. Brewer as president of Allied Realty Corp. in Chevy Chase. Holder of a law degree, Farr has been broker with Allied Realty, which is enalarging and modernizing its facilities at 7001 Wisconsin Ave. Brewer plans to maintain a relationship with the firm as a consultant and salesperson.

R. Daniel Lindley has been named president of American Mortgage Investors, a subsidiary of American Federal Savings and Loan Association. Lindley had been with Advance Morgage Corp. as manager of its operations in the Washington and Baltimore areas.

Margaret Leaf, former vice president and southern regional manager for Techbuilt, a manufactured housing company, has rejoined the firm as vice president of market development. Techbuilt was recently acquired by New England Components Inc. of North Dartmouth, Mass.

Ethel Holmes, a native Washingtonia who has been assistant manager of the Jack Foley Realty office in Bethesda, has been named manager of the firm's new office in Brandywine Plaza, River Road and 42d Street NW.

Dale R. Smith, a draftsman with the consulting engineering firm of Goodwin H. Taylor Ltd., was the winner of the A. Barry Morris award for excellence in drafting in the 12th annual competition held by the Consulting ENgineers Council in this area.

Kenneth E. Diehl, formerly with Webb & Knapp in New York City and with Shannon & Luchs here, has joined the Carey Winston Co. as a retail and shopping center leasing specialist. Recently, he was with W.C. Burns & Associates as a consultant for the new Federal Home Loan Bank Board building at 17th and G streets NW.

Marie Shannon has been named manager of the new Lewis & Silverman realty office in Montgomery Village.

Thomas Raybould, formerly manager of the McLean, office of Better Homes Realty, has joined MR Real Estate Inc., Vienna, as manager of the firm's office there. The firm headed by Grace Rogers and Margaret McGrath plans to open a new branch in the Springfield-Burke area in June.

Andrew Kremer, a student at George Washington University, has won the top scholarship prize of $500 in the annual competition sponsored by the Conculting Engineers Council of Metropolican Washington. Besides holding a 4.0 grade average in engineering studies at GWU, Kremer is president of the student chapter of the American Society of Civil Engineers.

Queenita Gaskins, Lee Cook and Cleola Jacobs, sales associates with Nyman Realty, recently were inducted into the John T. Nothnagle Round Table, the highest national level of achievement of the Gallery of Homes, a national franchising operation that recently held a convention in Dallas. Cook, Gaskins and Jacobs were inducted as senior sales counsellors. Nyman Realty, which has seven area offices, has been associated with the Gallery of Homes since 1972.