Have you considered an FHA loan, or other facility that requires a lower down payment?  

There is just a little less room for error when dealing with a smaller park as you don't have as many lot to absorb a vacancy or an increase in water usage(even if you can collect)..or some repairs to do etc.Good job on negotiating them down so far...for me i will still have to go lower and look something like this....200*18*12*.5/.1=216k purchase priceI prefer to pay lower than this based on a smaller park and limited upside potential based on your observation of market lot rents.  

I can't promote myself a FL Mortgage Broker on this site, so instead, if I were you, I'd look for something like a Stated Income ALT investor loan in the mid to upper 4% to lower 5% range on a jumbo loan at 75% ltv on a 10/10 arm, 300/240, no escrows and no PPP.And remember, use other people's money to make money!  

The sellers had high equity (they lived here for 25+ years) but low personal cash, and they needed the fast close to get the cash to purchase a home in a lower cost of living area.

Alternatively, you could buy an apartment building with a lower deposit and reach your goal even quicker.

If you go this route, I would focus on a single property - the one which is costing you the most in interest and/or the one which will yield the biggest free cash flow once paid down - until you reach any prepayment limits imposed by your financing terms.Additionally, if you are able to switch your payments to {accelerated} bi-weekly (26-payments a year) from monthly, that alone will trim your amortization and total cost of borrowing.Another thing I frequently do is to take-on variable rate financing on a property (which is usually at a lower interest rate than a fixed rate loan ... by as much as a 1 pt), but set my payment as though I have a fixed rate loan.  

Because banks will typically loan 80% of purchase price or 80% of appraisal whichever is lower.  

Hello, I am interested in buying a small single family house in a decent neighborhood (average median house price around 450k), but the seller would want to sell the land (50x100) next to it together for an extra 100k to make a deal. hypothetically I can negotiate it a lower price for the land (any suggestion on how to determine the value for the land), what kind of investment can I make to turn the land into something profitable rather than just being wasted?

Sorry if I spoil your secret William, “Minimizing your tenants rent without lowering your income” is better known as “Section 8”

Also look at the investment as a place you can safely put cash down and know it will be their if you ever need to exit with a higher return than putting it in a lower yielding investment.