So long story short we have a traveling nurse staying at our rental that got some water damage when the roof was being replaced, they don't have renter's insurance (which we require in the renter's agreement they sign), water damage has been remedied and is cosmetically minimally affected and still very much in a liveable state.

In Reno, NV the Tesla factory and building of the Tesla Semi-truck factory has been bringing more, construction, executives and engineers to the area for 1-8 weeks. 

I have heard developing an rv park one should budget $30k per space, which seems high to me but, all the 50 amp underground power, waste plumbing, possible lift stations, pads for rv's concrete use areas, pavement, landscaping, engineering, surveys, sitework etc, maybe?

During a final walk through, management sent photos of doorway damage that was extensive on 3 doorways, and will require a full door and door jamb replacement.

I would rather own 6 to 10 high quality appreciating properties than 20 to 30 lower priced rentals (e.g. replacing all those roofs, HVAC, all the tenants, turnover and property management fees).

You should engage an architect or surveyor/civil engineer for something like this.

Fees for new construction , between capitol connections , impact fees , environmental fees , engineering fees , etc  you CANT build AFFORDABLE housing .   

You can use this format when providing your email: JethroXsinistarYca, (replace X with @ while Y is a DOT ) Just let me know, Jethro."  

You will have to talk to your Local MLS, they should have a feed that you can provide to your database engineer, pretty much the same way Zillow gets all the MLS data. 

They are more sales than solutions IMO.Also be careful regarding the "structural engineer".