Is there a rooftop that a party could be hosted on?

Yes

Yes. 8UP is the restaurant and bar, located on the rooftop. They do have small event space. Or, an option to buy-out the entire bar. During the spring, summer and fall months, they have an open air patio. If interested, please call 8UP directly.

They do rent out for party an other things

They have a rooftop bar. Not sure if they rent it out for parties.