The topic of self-directed 401k has been discussed on the forum many times, here is a link to one of such discussions that you may find helpful:https://www.biggerpockets.com/forums/51/topics/527...There are several providers offering the service who are active on BP, do some research/reading and you will find out who the key players are.

You can also check occupancy rates and demand seasons on Airdna.co (not .com) Airdna does charge for it's service though.

I would call Jacob Blacher at Pillar to Post, Allied Inspection Services or BIS (Building Inspection Services) 

Companies put lots of money into researching where to build, then the info often finds its way to the internet for free. 

I'm trying to find a good company that can provide me with a service where I can put " txt: XYZ to 878787" etc. 

Please understand that I'm perfectly willing to give back some of my profit by paying for such a service if I already had the property under contract with a good chance of closing, but again, the problem here seems to be in the order of the events -- you need the repair estimate before you can put it under contract.

If all of the mobile homes are say 2-bedrooms, but you want to build all 4-bedroom homes to replace each MH, the sewer and water service to the neighborhood may be undersized compared to what is needed.

Secret service, witness protection, senator/house of rep, police detective, etc. 

Some of my service people bring guns with them. 

The pro-version is actually used by professional services like architects and contractors.