I want to refi. Any suggestions?

[Alex Clift]

Here's my situation.

I own a condo that I bought as an investment.  Current mortgage rate is 5% for a 30 yr fixed.
The building only has 4 units and two of them are owner occupied and two rented out.

Fannie Mae won't back a mortgage if the building is less than 50% rented....atleast that's what I've been told....so this is why I have a 5% rate in this current market.

Does anyone have any thoughts as to how I can get a better rate?   Preferably through a bank.  

Thanks