Robert Sigholtz, general manager of the D.C. Armory Board, said yesterday a lease is being negotiated with the Team America soccer team to play this spring and summer at RFK Stadium but that the document has not yet been signed. Sigholtz said, however, that he knows of no obstacles to block signing of the lease.

Howard Samuels, chief executive officer of the North American Soccer League, said that the backers of Team America will discuss terms of the RFK lease and other details over the next few days. He said there still remain problems to be worked out but that they are not great ones.

Tentative plans are to have Team America play 15 home games at RFK Stadium and 15 away games, he said. The team would also play in the NASL and represent the United States in World Cup and Olympic soccer competition.

He said the team hopes to begin training in about three weeks and to begin playing in April.

The United States Soccer Federation gave tentative approval for Team America over the weekend, pending some changes and an opportunity for the directors to see the final contract.

Unlike the other teams in the North American Soccer League, Team America would be made up of American citizens and its coach would also be the U.S. Olympic soccer coach, Samuels said.

He said the team would take time off from the 1984 NASL schedule to compete in the Los Angeles Olympics. It would also attempt to schedule international soccer games with other national teams.

Two other cities were understood to be competing for Team America, but Washington was believed to have an advantage over them. Sources said that a final resolution of the matter should come within 10 days to two weeks.