I'd imagine that the cellular provider would be seeking to improve the infrastructure in the particular area first?

After a few not so great results you suddenly improve your skills like anything else. 

The property value has been improving nicely for me, so I was thinking of selling it to lock in the profit (trying to time the market :D ).

Perfect prey for gurus, except this group usually lacks money they can take from them.Move up the age spectrum, young adults, much like the younger group but they are more mature, judgment has improved but generally we are still rather naive and trusting.

Are there any other improvements on the property like fencing, grading, roads, etc.?

If you add it to your balance sheet to improve your net worth then, again, that is not profit.  

what can I offer to them to improve everyone's position?

While it's just as possible that rates could improve tomorrow (after all, if lenders already "knew" that rates were going higher, they wouldn't be wasting their time offering you lower rates today), the classic lock/float quip applies: it's better to lock when you should have floated than to float when you should have locked.

But if you pay attention to where the local government is spending money you may be able to purchase if an area that  will be much improved later.  

As Ali mentioned, the Philly market for MFH is pretty competitive, however if you are willing to put some work in, or invest some capital to make some repairs, opportunities exist.One thing to note, if you buy in the next few months finding renters might be difficult if you do in fact make improvements to the property (as it is vacant).