I believe I received a quote for $110 a month or quarter.  

So we have to file in Mexico and then we deduct what we pay courtesy of the treaty for avoidance of double taxation.

I don't see a path to an official address (guest quarters are not eligible for separate addresses in SD) so looking for creative solutions.

In short, it sounds like you may be trying to DIY some complicated transactions without sufficient understanding of taxation, likely hurting yourself in the process.

Great suggestions and marketing strategy is top priority for this quarter.

Anyone blasted Led Zeppelin, No Quarter after a successful day evicting deadbeats in court?

Quarterly earnings pressure.

Especially in the places where it is a quarterly bill, it is always prudent to check any owner-responsible utilities before sending back the security deposit.  

HOA is on average 300, and mortgage and principal assuming 5% is 342 (assuming 80k, 20% down), property tax at 100/month, and home insurance at 100 a month.

The General Partner (sponsor) finds and manages the deal on behalf of the passive investors that receive monthly or quarterly checks, along with a detailed investment report that explains their investment and rate of return.