An “oversized Silicon Alley” is what some are calling Mayor de Blasio’s plan to transform Union Square and its southern stretches into the city’s next tech hub. The main component so far is the massive Union Square Tech Hub proposed to replace the P.C. Richard & Son building on East 14th Street, but Councilwoman Rosie Mendez and the Greenwich Village Society for Historic Preservation are advocating that, in exchange for the building, the city rezone the surrounding blocks to prevent an influx of out-of-scale development. Despite their oppositions, CetraRuddy has revealed on their site two environmentally friendly proposals for the site at 799 Broadway, the former home of the St. Denis Hotel at the southwest corner of East 11th Street. Spotted by CityRealty, the 240-foot, 17-story office building would be the first catering to the Mayor’s tech dreams, though the renderings are merely conceptual at this point.