Looking for sub-4.5% mortgage on multifamily

[Stone Teran]

I purchased a 6-unit apartment building one year ago.  The building is in great shape, occupancy is always 100% with no turnover, my credit is good, my cash reserves are good and the financials for the building last year are good.  I have no mortgage and I want cash out refinance.  The local banks are quoting rates over 5% interest.  Are there any online and/or national banks that are open to this very low risk proposition where I can find an interest rate under 4.5%?