There are at several uc/proposed skyscrapers in Philadelphia right now that are not listed on the skyscraperpage database.
115 S. 19th Street - 611 feet - 54 floors - Proposed
https://skyscraperpage.com/forum/sho...d.php?t=244190
1826 Chestnut Street - 570 feet - 50 floors - Proposed
https://skyscraperpage.com/forum/sho...d.php?t=245031
21st and Ludlow - 333 feet - 28 floors - proposed
https://skyscraperpage.com/forum/sho...d.php?t=252727
One Dock Street - 380 feet - 31 floors - under construction
https://skyscraperpage.com/forum/sho...d.php?t=237383
East Market Phase III - 372 feet - 23 floors - under construction -
https://skyscraperpage.com/forum/sho...d.php?t=241012
Penn's Landing Redevelopment Tower 1 - 703 feet - 57 floors - proposed
Penn's Landing Redevelopment Tower 2 - 567 feet - 46 floors - proposed
Penn's Landing Redevelopment Tower 3 - 446 feet - 36 floors - proposed
Penn's Landing Redevelopment Tower 4 - 370 feet - 30 floors - proposed
https://skyscraperpage.com/forum/sho...d.php?t=243850
The Mark at Philadelphia - 407 feet - 34 floors - proposed
https://skyscraperpage.com/forum/sho...d.php?t=252494
Broad and Lombard - 552 feet - 43 feet - proposed
https://skyscraperpage.com/forum/sho...d.php?t=250240
Furthermore, there's a 1980s never built supertall not in the database.
Philadelphia World Trade Center - 1,050 feet - 65 floors - cancelled
https://phillyyimby.com/2021/02/a-lo...supertall.html