The 140-unit Palisade Gardens apartments at 21st and North Scott streets in Arlington was recently traded by a partnership headed by Raymond J. Howar to Larry Suiters and Ronald Temple, trustees, for the Tamol building at 428-31 Wisconsin Ave. NW. Suiters and Temple recently purchased the office building from J. N. C. Enterprises Inc., headed by Jeffrey N. Cohen, for more than $3 million. Howar said he had a buyer for the 32-year-old apartment complex but preferred to make a trade for tax purposes.

Members of Local 400 of the Retail Store Employees Union voted recently to buy land and construct a $3 million headquarters building in Shell Oil Co.'s Metro-East industrial park complex in Prince George's County. The union will buy a 2.2 acre site in 80-acre tract at the beltway and Rte. 50, the area where the New Carrollton Metro-Metroliner Station is scheduled to be open later this year.

The 195 Broadway Corp., a subsidiary of AT&T, has signed up as a major tenant in the Marfair building at 499 S. Capitol St. James Hunter, executive vice president of the Braedon Companies, said that 195 Broadway will occupy three floors with approximately 72,000 square feet, starting next month.

Dewberry, Nealon & Davis is one of 168 design firms selected to participate in a national research project to develop energy performance standards for the design of new buildings. The contract award was made by the AIA Research Corp. under the sponsorship of the departments of Housing and Urban Development and Energy. HUD has been directed to develop and implement energy performance standards for the design of new buildings by 1980.