Alright, so because I have nothing to do tonight, I measured and guesstimated the height of each tower based off the height of Evo which is 430 feet tall. Also guesstimated the floor count of each tower based on Evo and FMC towers:
1,095 FT - 70 FLOORS - Tallest Tower
670 FT - 45 FLOORS - 3100 block JFK tall tower
515 FT - 42 FLOORS - 30th and Chestnut
435 FT - 36 FLOORS - 3100 block JFK short tower
425 FT - 30 FLOORS - 30th and Market
385 FT - 28 FLOORS - 3100 block Market tower
380 FT - 28 FLOORS - 31st and JFK tower
375 FT - 31 FLOORS - 31st and Market tower
All in all, looks like this could be the second tallest in the city