Ever since One Liberty Place surpassed the height of Billy Penn atop City Hall, Philadelphia’s skyline has been on the rise. Next year, it will be even taller with the opening of the Comcast Technology Center, the tallest tower in the city and state of Pennsylvania.

But while Philly has experienced a recent explosion of trophy towers and class A buildings, its skyline still has plenty of catching up to do with the rest of the U.S. From the glass half full perspective, Philly still has room to grow.

That’s according to a new Skyline report released by the commercial real estate firm JLL, which took a deep dive into various U.S. cities’ skylines and the buildings that make them up. In the case of Philadelphia, this ranges from The old Post Office building at 2970 Market to the Comcast Technology Center.