The bank won't give me enough to buy the property. What can I do?

[Charles Jessup]

I'm trying to buy a owner-occupied commercial property for $345,000, and the bank will only approve us buying $300,000.  (Loan of of $270k & I put $30k down).  I have 30k for a downpayment but not 75k to reach asking price. 
How could I look for a second loan source for the difference?  Would that affect the bank's willingness to loan for the property? 
Do you know someone that could help me?