The costs to do a 1031 Exchange, whether you are talking about a four-plex or 50 plus unit apartment complex area are absolutely not cost prohibitive.

Borrower that is high income or high asset is screwed.      The balance of seminar was explaining how to do the Strategic foreclosure in such a way to prohibit lender from doing this and forcing lender to do a "Deed in Reduction", or a "Modification in Lieu" .

With IRA Money, needs custodian, prohibited transactions adhered to.b.

HUD is very clear that if they catch an agent giving out lockbox codes to their buyers they may take away the office NAID number and they entire office will be prohibited from selling or buying HUD homes.

I have looked into a blanket LLC policy but it was prohibitively more expensive.* Sometimes it can be a pain to setup utilities for a residential property in a business name.

For many larger/older buildings the cost and headache to retrofit an occupied building is prohibitive.

I think the mountain resort idea is risky, STRS are oversaturated in many markets, and you have to deal with other issues - out of town property management, higher than normal maintenance costs, STR rules, potentially cost prohibitive fire insurance costs, etc. 

All associations that I know of prohibit house hacking (subdividing a unit).

@Owen Lee single family use is listed as "expressly prohibited" in CMX-3.

A few thousand in consulting legal fees can really open your eyes to what the process will be and how long/much it will take.Providing you examples to what would comply probably is prohibited in the city permit examiner employee's job description (practicing law), a city will generally hand you a document, but they are not going to give legal advice.