It's a response to the crane collapse on 51st Street that killed seven people a week and a half ago. That accident occurred while workers were trying to extend the crane, something called "jumping."

From now on, the city says an inspector must be present at a jump and that the engineer who designed the crane must also inspect it before it's raised.

DOB Commissioner Patricia Lancaster says general contractors will also be responsible for gathering all the workers involved in the process.

LANCASTER: Developers from now on, are gonna have to have pre-jump meetings to make sure they're gonna do the work right and that we're gonna be on site to do the work right to make sure it's done right.

REPORTER: Lancaster says the new rules are a precautionary measure while the city awaits the results of a forensic investigation.

Meanwhile, an inspection of cranes across the city continues. Tower cranes, like the one that collapsed this month are being inspected first, a process that should be completed in about three weeks.

So far, nine cranes at six different sites have been inspected. Three were problematic and shutdown, including a crane being used at the Trump SoHo tower where a construction worker died earlier this year.