KidPhilly, Liberty One is all offices. Only Liberty two has residential units in it. Floors 37 and 40-57 have condo space in them and Liberty two is 848 feet tall.
Two Liberty Place
The tallest ALL residential building is the Residences at the Ritz Carlton at 518 feet.
As far as I know there are still plans to construct the hotel on the parking lot behind it that will rise higher then this tower.
The Murano is another at 475 feet. The Murano has some pretty pricey condos. Hunter Pence of the Philadelphia Phillies lives here in a Pent House
There are plenty of high rise residential buildings through out the city. There are plenty in Rittenhouse Square. The most expensive one's in Rittenhouse Square are
Ten Rittenhouse (still under construction in this photo)
and 1706 Rittenhouse (the one in the front) also Cliff Lee and Jason Papelbon live here
Here are some of the Rittenhouse residential highrises
There is also the St. James. Which is my personal favorite (not architecture wise, but location wise). I will be living here after school.
The Symphony House
Waterfront Square (2 more towers planned)
Millennium Hall (Drexel University Dorm)
There are plenty more I am not naming as well. There are also hundreds of older residential skyscrapers and highrises like
The Metropolitan
and the Aria (which just got a new facade)
Residential Skyscrapers under construction are
2116 Chestnut Street (being built by Chicago developer John Buck Co.)
http://www.phillybroadcaster.com/wp-content/uploads/hillman5.jpg (broken link)
Gateway South Residence (Temple U)
Proposed Residential Skyscrapers
Mandeville Place (On Hold currently)
Cira Center South (Shorter tower residential, taller tower offices)
Chinatown Eastern Tower Community Center
Waterfront Square (other two towers)
Trump Tower Philadelphia (currently on hold)
As a bonus picture, here was a mock up of all the towers proposed for the Waterfront before the recession hit. Most of these proposals are starting to make their way back onto the development scene
This is the hotel/residences proposed for the lot behind Residences at the Ritz
1601 Vine is another one on hold
Parkway 22 is also on hold
Castleway Tower is another one proposed for Rittenhouse Square. Residential/Hotel
There are plenty more too that I am forgetting or do not have renders currently like the third Museum Tower which was just proposed this year near the Ben Franklin Parkway in Franklintown