However if someone is looking to house hack this is a route worth investigating.

I was investigating them for a potential investment in multi family with 10+ units. 

First, before I'd consider paint, I'd investigate where the black is from.

I have never investigated the cost or coverage of hazmat insurance.

These seemingly random and frequent investigations by code enforcement who's sole job is to "find something wrong" is going to create astronomical costs that people who are owner occupied in their homes would not even think is an issue.

@Stephen SawrieFirst thing you should do is sit down and research all of the rules that apply to SD IRAs and either print them or save them so you have the rules in hand as you investigate how you are going to derive income from your IRA.

Why should I run the risk of being accused of being the old geezer who parades around in front of the open window.Years ago I was a private investigator.

In our ongoing quest to get costs down, my CEO pushed me to investigate the modular option.  

On it's face, it seems worth a more thorough investigation. 

I do not answer the phone because I could easily miss a requirement and often tenants will waste my time when they are not going to get approved.As for investigating phone number, I use internet.