The more people to poke holes in the document the better.

Be prepared for a property inspection to verify things like condition and to provide supporting documents to show any deficiencies or obsolescence which would contribute to a lower value.  

Because upon transfer, you could violate the due on sale clause likely found in your mortgage documents.

As long as the timeline for your closing on the 1031 and the 30 day closing requirement for a cash Hud purchase coincide ,you should be fineYou will need a proof of funds letter from your facilitator showing sufficient cash available to closeI would also check with the facilitator and the title company you choose and ask if any additional closing documents will need to be signed by HUD and get them approved in advance if necessary .  

A high percentage fail and thus are easily seen as a scam.My LO was structured in two documents to avoid the issue AND both the lease and the option were NOT ASSIGNABLE. 

You won't have to wait on inspections to get draws, spend time putting documentation together, or worry about timing when it comes to paying contractors.  

RocketLawyer has templates on their websites and you get a document free (I am not affiliated with them but have used their services before).

The property has an assigned REO Document number along with a foreclosure date.  

The 21 day time clock however started when the landlord got possession, either by declaring abandonment which take several weeks or going to court to get possession which can take months or just picking up the keys and documenting a defacto tenant move out/ abandonment.So yes, the landlord was obligated to mail you a security deposit accounting to your last known address by the end of the 21st day. 

@Jenifer Levini this is what I found: https://www.rocketlawyer.com/document/lease-with-option-to-purchase.rl