One thing to be mindful of is the cash flow of the property as you get into higher LTVs.

Are you looking to qualify for a primary residence purchase loan or an investment property purchase loan?

How much rent are you getting and are you planning to buy more properties?

I'd sell the property and 1031 in to something without an HOA. 

Just outline expectations and roles, and what each of you guys are going to do, and how properties will be acquired and how they will be disposed of, and how and when money will be taken out of the company and you should be good.

Upon inspection the appraiser will see the crawl space and see it was a mobile home plus a HUD tag and public record.One of the requirements in mobile home financing is the property "Must" be on a concrete permanent foundation(in order to be real property) on top of that it requires concrete pillars, skirting and the "Well and Septic" dug and placed within legal distance from subject property.

Owning rental properties, including STRs, does not allow you to fund SEP IRAs.

I love fixing old properties and making houses into homes.

I have reached out and spoken with the HOA management property manager myself, and just keep getting BS excuses and no sense of urgency on this matter. 

It seems like you just really wanted this property so you let your emotions drive your offer.