Last time we checked in with the Comcast Innovation and Technology Center, it was just one giant hole in the ground. Well, that hole is actually a little deeper and about to be filled with 4,000 cubic yards of concrete that will make up the foundation for Philly’s soon-to-be-tallest building. To top it off (or bottom it out?), this will be the largest concrete pour in the history of Philadelphia. Bob Fernandez of The Inquirer reports that 50 trucks making a total 400 deliveries starting Friday at midnight. Once complete, the Foster+Partners-designed CITC will be tallest building in the United States outside of New York and Chicago.

From The Inquirer:

“Prep work will begin at the construction site at midnight Friday and the concrete pouring will begin at 2 a.m. The 1800 block of Arch Street is expected to be closed for the duration of the concrete pour. That stretch is planned to reopen at 5 p.m. Saturday, officials said.”

Thornton Tomasetti designed the structural engineering of the CITC, which will rise 1,121-feet above the city streets, semi-aided by a tall blade. It will house Comcast’s Millennial-driven, vertical tech campus. To actually top it off, a 222-room Four Seasons Hotel will move from One Logan Square to the upper floors of the CITC. Talk about a view. Gensler will be heading the Utopian interior design of the building.B. Petrini and Sons out of King of Prussia is running the concrete-pouring show. Fran Petrini spoke with Philadelphia Business Journal about how weather will factor into the event:

“Rain or shine, it needs to get done because the city won’t let us shut the streets down over the holidays. The cold is never the issue. What we need to worry about is the concrete getting too hot. This is perfect weather for pouring the foundation. The 30s and 40s…you couldn’t pick better weather.”

In a word: Awesome.

Read the full article at Philly Curbed.