The builder will simply let you know when the house is close to completion so you can then sell your old property and buy the new one using a regular 1031.With an improvement exchange, you've already sold your old property generally. 

For a regular turnover we try to have a lease signed before the previous tenant is out.

To be considered a trade or business for the qualified business income deduction, all of these must be true:Your participation in the rental activity must be regular, continuous, and substantial.You conduct the rental activity with the expectation that you'll make a profit.The rental activity is conducted in the United States or Puerto Rico.Rental activities that are considered trades or businesses include:A real estate professional who materially participates in the activityA rental to a commonly owned trade or businessRental activities that aren't considered trades or businesses include:Rentals for less than fair market value (FMV)A lease agreement in which the tenant pays for real estate taxes, insurance, and maintenanceA vacation home that's rented out and also used as a personal home

Can we just end the lease like other regular tenants?

-- You will not find this level of service with a regular bank or credit union. 

If you’re talking in city limits you might have a permit problem because they are ridiculously annoying to work with for even regular construction, outside of city limits though, especially outside of allegheny county I assume you’d have an easier go at it. 

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Also don't use regular drywall. 

Investors regularly quitclaim properties from their personal name into an LLC.

I think bad actors will always be around, there is a need for some consumer protection, but I think regular laws can do this.