How to you properly charge the tenants seasonal usage (high in winter/low in summer) and when there's not equal gas appliances between the units? 

You need to do more than a day of fixups - painting, carpet steam cleaned, cleaning all drawers and appliances, exterior touchups.You have a "perfect" process set out, but it's one that will push you to make a bad tenant decision and not vet them properly.

The second lien also means you’re in a junior position if the buyer defaults, so you’ll want to be aware of that risk too.Overall, owner financing can be a win-win, but it’s important to have everything structured properly to protect your interests.Cheers,William

You could consider it disposable but I am guess the costs to get it safe for habitation will really impact your decision.Regarding the house on stilts, if it is properly engineered it would be considered real property with a unique foundation.

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

The applicant with esa/support animals pays nothing to sign up and petscreening will verify that they are properly registered as such and that they are not trying to claim that they are and save money on potential extra pet fees/rent. 

2- IF only $30K is labeled & considered OPTION CONSIDERATION funds paid for the OPTION (thus Not immediately taxable) What do you call or or would be a proper way to DESIGNATE the other $30K in funds given to the Property Seller?

To add to what @Jonathan Greene wrote:1) Understanding the local market, so you know what Neighborhood Class your building is located in, what Class your Building is (condition & amenities), and what corresponding class of tenants will be attracted.2) Using all this data to properly set your expectations and a realistic ROI.3) How to better screen prospective tenants, including catching fraud, so your property performs better.

If not, Proper, CBIZ, Foremost and a lot of others offer them.Get it listed on AirBNB and VRBO.

We didn’t accept the payment and requested proper payment.