Next came what I would call 'land speculation' (SDIRA purchases unimproved parcel and subdivides or does site improvements, then cashes out) followed by a distant last place - rental investment.

I have not had any direct contact with him, but the info on his site is typically spot-on and I link to it every now and again. 

- How are you verifying ad accuracy on all the posted sites?

I've had good results with those they seem to be the most popular nowadays. 

Here is a quick background story on our success and some tips and tricks I feel that anyone could use to maximize their cash flow potential using short term vacation rentals on sites such as Airbnb and VRBO.

I can not find on this site where to post listings. 

Apts complexes consisting of 100s or units can afford on site property manager, assistant managers, maintenance staff, volume discounts, etc.  

Contrary to popular belief, this is not set because I believe it will give me a higher return.

If so you can look into Cash Re-Fi (not as popular these days with high rates) OR look into Home Equity Loan / Home Equity Line of Credit.

Websites like Architectural Designs, Houseplans.com, and The House Designers are popular choices among real estate investors and builders.