I’m not a electrician but my common sense is that it’s illegal illegal code violation.

Don't get caught up in the BP theology of only buying homes with specific specs because some of those specs aren't common in older midwest areas but there's plenty of inventory that makes a good rental, rents fast, and is easy to sell when the time is needed.

Very common: they have no financial discipline and so never save any cash to make purchases.

This is a common question, and the answer is yes.

I would feel this would be a common topic that is covered from a local "guru" (it is here in Texas).  

Yes, it is common to ask for leases, ledgers, full applications packages during due diligence, should be part of your PA too (for next time).If you buy it, you can start from square one with applications, qualifying and new leases and you will be set. 

I’ve not had any FHA loans not go through because of a non conforming property because this is actually quite common with older neighborhoods.Example, I had 12 lots together and all were 40’ width.

The laws are different for mobile homes versus single family.You want to first read your lease, what notice is required, and then secondly know what laws apply depending on the property type.The most commonly utilized Arizona lease by default requires a 30-day notice prior to the renewal date, which is typically on the 1st of the month.

Most states have a Tenancy in Common or similar provision. 

It depends on how the title will be held.There are two ways that ownership of title can be heldTenants in Common(should have a TIC agreement)Through an entity(LLC, LP, Corp, etc)