Appeal from Ct. App. N. Y. [Probable jurisdiction noted, 434 U. S. 983.] Motions of Pacific Legal Foundation, National Trust for Historic Preservation et al., and Real Estate Board of New York, Inc., for leave to file briefs as amici curiae granted. Motion of the Solicitor General to participate in oral argument as amicus curiae granted and 15 minutes allotted for that purpose. Appellants also allotted 15 additional minutes for oral argument.