Artistic considerations--not money woes--have prompted New York's Actors Enclave to open negotiations to move the group to Boston's yet-to-be-completed Midtown Cultural District. Artistic director Colleen Jenkins says the non-profit group, formed in 1973 by former students of Lee Strasberg, has been looking to move its base for three years because its members want an "arts home" instead of what they called the "crass commercialism" of New York theater. "The community life in Manhattan is not what it used to be," she said. "You find a lot of glitz and commercialism these days. Because of all the real estate and buildings going up, a lot of artists have lost their space." Among the company's members: E.G. Marshall, Joanne Woodward, Maureen Stapleton, Karl Malden, Julie Harris and Anthony Quinn.