You have to check the company out online to ensure they are legit.The bad news (in my personal experience) is that a lot of traveling nurses are problematic.

For me, ensure the deal is outstanding provide buffer for issues that may arise.

But to ensure that the rule is that you must purchase at least as much as you sell.  

Whenever you are buying a property out of state you should do a few things to ensure it's as smooth as possible.

To avoid undermining the democratization of real estate ownership, a combination of technological solutions (smart contracts, decentralized autonomous organizations (DAOs), and regulatory frameworks that ensure a level playing field for all participants) would be necessary.However, I don’t think even the most restrictive of regulations could stop the concentration of ownership by large entities.

At that point, I review the documents closely to ensure there have NOT been any unapproved changes or inadvertent errors.

Ensure the potential returns from the project can offset these additional costs and you'll do fine. 

if not how do you ensure happy co-tenancy, etc.)

Hopefully you have "before work completed" pictures to ensure you know what it looked like previously and what it looks like when done.4.

I have seen multiple threads where the source of problems with a property management company is the property manager leaving.I can't think of any other business models where the salesperson is also responsible for fulfillment--ensuring problems in service in the event of departure from the company.The staffing model where property manager A manages doors 1-100 and property manager B manages doors 101-200 is fundamentally flawed and leads to problems exactly like Marvin's.