I was reading over some of the other, similar posts and wanted to add a few other comments:

I completely uninstalled all remnants of Java and LimeWire, rebooted, installed the Java version mentioned, then LimeWire, then restarted again in the troubleshooting process.

Thanks again!

Is Comcast the condo complex's ISP? Is there any chance that the complex has a firewall associated with it's internet service? You could ask the manager. Do you know if any other people there can use p2p?

Some people have had trouble with Comcast. In some cases they're limiting p2p uploads but AFAIK aren't actually blocking connections. Use the forum search to look for Comcast & you'll be able to look through older threads.

Which other Java version did you install? Was it JRE 1.5.0_11?

Try changing ports. In LW tools > options > advanced > firewall config. Change LW's listening port to 64049, or something in the range of 49152 - 65535. Apply to save the change. Any ports forwarded within a router will also have to change.

You could also redo your port forwarding. Have a look on the list of routers here. There's no WRT54GS v2 but there's a WRT54GS & a v4...maybe the instructions will still suit your router.
PortForward.com - Free Help Setting up Your Router or Firewall
Don't forget the step of setting up a static IP address. LW's listening port, port in the 'manual port forward' box & port forwarded within a router must all be the same number.

You could also try downloading the LW Beta version & see if that connects.
Lime Wire » Download LimeWire

As a last ditch effort you could delete LW's preferences folder when LW's properly closed. See point 3 here & also point 2 if you've used older versions of LW in the past (there could be a folder in either location).
Fixes for LimeWire
This will kill all of your settings within options, you'll have to go back through afterwards & reset things. If you're not sure of your settings, go through LW's tools > options & write them all down, so that you can reset things later.