J.H. Burton & Sons Inc., an Olney-based landscaping and garden center company, has restructured its landscape division to sharply scale down its commercial landscaping work because of the area's building slowdown, the company said.

Burton said the landscaping division, which has done several commercial landscaping projects in the Washington area, will focus on residential landscaping and small commercial jobs.

The company operates two retail garden centers and two florists as well as its landscaping division.

Montgomery Aviation Ltd., a flight school based in Gaithersburg, acquired CM Leasing Inc. of Gaithersburg for an undisclosed amount.

The merger gives Montgomery Aviation an operating flight line of 14 aircraft and four helicopters at Montgomery County Airport.

Before the merger, CM Leasing had been a primary supplier of Montgomery Aviation's aircraft.

Martha Weems Ltd., a McLean-based marketing and advertising firm, was purchased for an undisclosed amount by Deborah Dunn, the company's director of sales, from Communicorp of Columbus, Ga.

The Columbia, Md.-based advertising firm Fletcher-Barnhardt & White Inc. acquired Tarheel Concepts Inc. of Raleigh, an advertising distributor, for undisclosed terms.

Eisner and Associates Inc. of Baltimore won advertising contracts from Farmers & Mechanics Bank of Frederick, Fair Oaks Hospital of Fairfax, Lakeside Shopping Center of Sterling Heights, Mich., and the Williamsburg Group of Williamsburg, Va., that will bring the agency $2.5 million in new billings, Eisner officials said.

Contel ASC of Rockville received a contract from China's Xinhua News Agency to install a private data broadcast network valued at $1 million.

MCI Communications Corp. of Washington won a contract from the American Red Cross to provide an emergency response telecommunications network for its domestic operations.

Europ Assistance Worldwide Services Inc. of Washington received a contract to provide travel assistance services to Turner Broadcasting System Inc. employees.

The Forbes Group of Fairfax gained a contract from the Consumer Bankers Association of Rosslyn to work with member banks on community issues.

George Mason University's Transportation Center in Fairfax and the Titan Corp. of Vienna agreed to finish developing a geographic computer model called Computer Understandable Terrain Model that could be used to determine how weather and pollution affect land and transportation facilities in a region.

United Press International of Washington introduced the UPI Environmental NewsNow news and information service.

Universal Security Instruments Inc. of Owings Mills, Md., received Federal Communications Commission approval for innerView, a wireless home broadcast device that can send signals from a VCR to all television sets within the same house.

Systems Consulting Services Inc. of Catonsville, Md., formed a financial advisory and business consulting services division.

Spector, Knapp & Baughman Ltd. of Washington was selected to provide tenant planning services for St. Matthew's Court, a 160,000-square-foot commercial office project on Rhode Island Avenue NW.

Kathy Giannetti Public Relations opened in University Hills, Md.

Shumacker & Thompson of Chattanooga, Tenn., opened an office in Washington.

Walkabout Productions Inc., a film and video documentary producer that specializes in science, the environment and outdoor recreation, opened in Annapolis.

Steven L. Lebling opened Property Consortium Inc. in Rockville.

Ann McGovern and Jack Lanza opened 1050 A.D. Inc., an advertising and design firm, in Washington.

Richard Lazarnick opened Market Associates Group in Baltimore to provide public relations and marketing analysis for health care and financial services institutions.

Announcements of news and developments affecting Washington area companies should be sent to Regional Report, Business News Department, The Washington Post, 1150 15th St. NW, Washington, D.C. 20071.