Stop the Dorm/Save Our School celebrated the 100th birthday of the old P.S. 64 on E. Ninth St. — and hoped for many more to come. At the party earlier this month were from left, Roland Legiardi-Laura; Michael Rosen; Morgan Rosen; Maxwell Stalker-Wilde; Julie Stalker-Wilde; Paul Garrin; Carol Irving; Jackson Stalker-Wilde; Nicola Baker; and in left foreground, Mr. Jenkins, the pug, Sue Scott and her son Chase Squier. The owner of the old building, Gregg Singer, has designed a 23-story university dormitory tower for the site. However, the nonprofit National Development Council, which was exploring leasing and operating the dorm, backed out last month, and local legislators say they won’t authorize Dormitory Authority bonds for the project. Singer’s contractor recently renewed plans to demolish the building’s cast-stone exterior details, which S.T.D. fears is an attempt to block their effort to landmark the building. S.T.D. has sent thousands of petition signatures to the Landmarks Preservation Commission and postcards to Mayor Bloomberg calling for the landmarking of the classic H-shaped — when viewed from above — building, designed by Charles B.J. Snyder. A number of Snyder school buildings around the city are landmarked. S.T.D. and Councilmember Margarita Lopez want to restore the building — most recently home to CHARAS/El Bohio — as a community and arts center.