Work began recently on a 42-unit condominium building next to Prospect House in Arlington, the developer, Marvin Weissberg, reported. The units will have living rooms with 13-foot ceilings and will be priced at more than $200,000, he said.

The Weslie building is being built on one acre at 14th and Oak streets next to Prospect House, an apartment building.

"When the land was acquired several years ago," Weissberg said, "there was some concern that the price of the land per apartment unit ($15,000) was greater than ever paid previously in Northern Virginia for an apartment site. Today the cost of the land is regarded as relatively inexpensive."

The developer said that, based on zoning, construction of 57 apartment was permitted. "But the view of the Lincoln Memorial, the Washington Monument and other Mall-related buildings all the way to the Capitol was such that we decided to go with higher front views and only 42 units," Weissberg said. The architect was Salditt, Lipp and Helbing.

Weissberg said the units will be sold starting in the spring, with completion scheduled for next September.

National Permanent Federal Savings and Loan Association has committed permanent financing for condominium buyers and the construction loan is from Riggs National Bank.