So right now if someone wants to book 26/27 Apr we can upcharge 100% of the Thursday rate so essentially they pay for the 3rd night without realizing it, and it leaves that day open to be booked. 

Are there any resources where you can put your income, purchase price, down payment and credit score and see potential rates and which lenders do it?

@Cillian KellyI never do because my rate is 3%.

Also insurance rates are cheaper in SC than FL.

How you proceed will depend on a few factors:- financing will depend on your exit strategy - you'll be best off if you can decided the exit plan (LTR, MTR, or STR) before buying- Since you're not employed and living on savings, what is your burn rate and your cash runway?

The property I've set my sights on is a 9-plex where the owners are willing to carry 70% of the loan at a 5.5% rate for a $1,800,000 building.

People's debt, tax rates and situations vary greatly. 

I asked about costs/rate/terms and he said "6 percent" interest for 5 years.  

Have they bought the rate down?

That property won't sell for another couple of years and I messed up and didn't lock in when rates were low and am now paying triple on the interest only payment.