A Manhattan lawmaker wants to give communities a new tool in their fight against hulking towers: advance notice of when air rights transfers occur.

City Council member Ben Kallos, who represents the Upper East Side, introduced a bill Thursday that would mandate the Department of Finance notify and provide the local community board, councilmember, borough president, and City Council Speaker with the relevant documentation within five days of such a transfer occurring, according to Kallos. The legislation, he says, will give New Yorkers more time to prepare when a developer is cobbling together air rights or zoning lots to build towering buildings that loom over neighbors, and may give them pause before selling their unused development rights.

“My hope is that folks may say, ‘Not today. I’m not going to sell out and I’m not going to sell you my air rights,’” Kallos told Curbed. “When you’re racing the clock every second counts. The community needs as much notice as possible so that they can react and work with the developer to either get a responsible building or take necessary actions