This is a single-member special purpose LLC, must be set up in a certain way to be IRS-compliant.

Find a nice house or duplex in Euclid that is POS compliant and collect the cash every month. 

@Salomon W.I do and recommend a very thorough screening including an application, credit check, criminal check and eviction check on everybody that will be living in the house and all persons, even the pet is named in my state compliant lease.

You must have 3 comps to be compliant with appraisal regulations.

I would assume they were legal when they were built, and grandfathered in when it was zoned single family....grandfathered non conforming properties do have some restrictions, involving major alterations, etc.If the properties are large enough, the lots could be reconfigured to have two different, compliant properties, assuming you could meet current set back and lot size requirements.

Just be sure your lease is compliant with the landlord-tenant laws for your jurisdiction and meet the requirements of your local courts. 

Lauderdale, but you might make less revenue than a Miami Beach property that's legal and HOA-compliant.

The reason Brian mentioned me is that he has an image to uphold, I could care less and I jump on bad stuff to protect those trying to learn the legal, ethical and compliant ways to work in RE. :)

Fractionals - DSTs and TICs will be the 1031 compliant products that will shelter the tax. 

Reputable Solo 401k provider will take care of all required plan updates to keep you IRS-compliant and provide all the guidance and support you need.