But in the future, prevent the existing landlord from renting to anyone else while in escrow.

No amount of due diligence, screening turn key companies, or interviewing property managers will every prevent this maxim of real estate from occurring over and over again. 

The fear of the unknown by the "guest" is what prevents 100% occupancy.My feeling about Portland, and other communities having difficulty embracing the sharing economy, like my HOA, has to do with the horror stories that @ Marcia Maynard mentions.

You have 180 days from the close of your sale to complete the purchase but it is usually the 45 day period that prevents people from completing a successful 1031 exchange.While you cannot close on your purchase until after you close your sale the order you go under contract does not matter so what we recommend is that as soon as a client feels confident with their sale happening they start shopping for their replacement property and put it under contract as soon as they can maybe even before they close their sale.  

I read & talk to BP that the best way to prevent acceleration & due on sale is just to tell the bank i'm going to pay for the pre-foreclosure seller in exchange for his property title.

My thought is they are like all items you need to take care of them and in some cases you need to do preventive elimination. 

I had my attorney draw up papers that might help me with this to prevent any lawsuits but in it still can happen.

I don't want these items that will come up to prevent a tenant from being able to pay rent. 

It can be found at https://dl.dropboxusercontent.com/u/105466347/713bonniebrae.pdfPLUMBING: Replace PVC piping connections to water heater with copper (37), repair or replace damaged ice maker (45); replace damaged dishwasher hose (48), replace leaking pipes under sink (49); replace sub floor under tub and toilet with accompanying tiling to area floor and address relevant leak(54); replace flexible drainline(64); Install missing bathtub drain stopper (62); add backflow prevention to outside spigot (91)STRUCTURE: Replace hurricane straps with approved nails (71); reclean ductwork (74); extend gas fired flue (86); Remove standing water; dig vent wells and/or repair basement walling etc to stop water entering crawl space (87); insulate water pipes in crawl space (92)ROOF & GUTTERS: Replace damaged duct end-cap and cover (10); Add downspout extensions to divert rainwater away from house: Add matching gutter extensions to extend from roof into gutters; Clear moss from roof (20); Add splash blocks and diverter pipes away from structure (14); Replace rain boots and do remedial roof work(13/15); align gutters properly and renail to fascia for correct flow(16); extend downspouts into gutters (18), clean out downspouts and gutters (19); repair leak point (70)ELEC & HVAC: Install 1 carbon-monoxide detector in hallway near base of stairs (27); Install balance of internal coverplates as well as exterior outlet cover (28,29); Make good loose light fixtures (30) and attach faulty dishwasher bracket (46), replace HVAC filter (77)INTERIOR: Remove old or molded caulk and silicone to tile in bathrooms (58,59,61,63)and and kitchen back-splash (50).

It eliminates the applicants that would never pass my screening process and prevents me from wasting my time.