By Gus Saltonstall

Demolition work has revved up in September after permits were filed with the city for work at the former ABC campus site, now owned by Extell Development. The site covers the square block of West 66th to 67th streets between Columbus Avenue and Central Park West.

While no plans have been sent to the city by Extell regarding what it will build there once the existing structures are demolished, the developer’s founder, Gary Barnett, has told the Upper West Side Community Board 7 that it hopes to construct two properties on the site, including a 1,200-foot-tall luxury residential building that would also feature an unspecified number of affordable units.

If built, the project would be roughly the same height as the Empire State Building.

In the past two weeks, West

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