I'm not in Lakeland, I am a Realtor in Ft Myers but I'm assuming that policies are the same.
I don't know of a commercial lender that would do a mortgage on a $15,000 property. It wouldn't make sense financially for them.
There are private lenders out there but the interest rate is upwards of 10%.
If I can answer any questions, please feel free to contact me. I'll help if I can.