The terms of a lease for use of RFK Stadium by an expansion baseball franchise, if one is awarded to Washington, have been set and are awaiting final signatures, the stadium's general manager, Jim Dalrymple, said yesterday.

Dalrymple declined to reveal the lease's terms, but said "signs are very, very favorable" that it will receive final approval from the D.C. Armory Board, composed of Mayor Marion Barry, Maj. Gen. Calvin G. Franklin of the D.C. National Guard and businessman Stuart Long.

"The negotiations have been completed," Dalrymple said. "It's a matter of getting all the signatures attached. I would hope all the signatures could be in place by the end of the week."

He said a main stumbling block is getting the signature of the person representing the organization seeking the lease. Dalrymple said that person will be abroad for the next couple of weeks.

Dalrymple declined to name the person, simply identified as the organization's "president," but Franklin said Tuesday that Washington developer John Akridge was "talking about terms and conditions" for a lease with Armory Board general counsel Artis Hampshire-Cowan.

In addition, Dalrymple said he has had no contact with Capital Region Baseball Inc., a separate prospective ownership group seeking a franchise that would begin playing at RFK Stadium, then move to a new facility in Northern Virginia.

"The Virginia group has never made any overtures to the Armory Board," Dalrymple said.

Akridge, who is involved with a group seeking one of the two expansion franchises the National League will award next year, confirmed on Tuesday that he had discussions with Hampshire-Cowan, but he said "I wouldn't classify them as anything but discussions."

Dalrymple said the organization seeking the lease has "already applied" for one of the questionnaires the National League Expansion Committee will distribute in July. Those questionnaires, which must be returned within 30 days of receipt, are expected to specify the entry fee and ask prospective ownership groups for information about their financial backing and stadiums, including, if possible, lease terms.

Dalrymple said the organization seeking the lease for RFK Stadium also is "running other parallel studies with a financial consultant and a public relations firm."

"They are building a program that is well-organized," he said. "When they lay it out, they want to have it well-orchestrated."

The Washington Redskins are currently RFK Stadium's main tenant. Redskins owner Jack Kent Cooke has discussed building a new stadium and is close to a final agreement with the city, sources have said. The Redskins' stadium lease expires at the conclusion of the 1990 football season but the club is expected to sign an extension to stay until the new facility is completed.

This could cause a problem for a baseball team. The National League Expansion Committee, which will award the teams for the 1993 season, has said prospective ownership groups planning to locate a team at a multi-use stadium must have a lease under which baseball is given priority over any other event.

However, Dalrymple said, "Everything has been taken into consideration" during the negotiation of the baseball lease.