Don't let his guy punk you, and never let them see you to be so quick to give out incentives to not complain (such as waiving rent).

Cut free of your "golden handcuffs" with the minimal interest rates on these properties and sell them all (or the biggest headache properties) and do a 1031 exchange into a bigger property or package of multi families where the cash flow is better, numbers make sense, and you can streamline property maintenance and management rather than having 6 different single family homes. 

Working with them is the biggest mistake of my real estate journey.

As for the feds offering low interest loan incentives for small businesses - no, not that I know of.

Supply and Demand Dynamics Impact: Rent control can reduce the incentive for developers to build new rental units, which may limit housing supply and affect demand.

Even if it's the biggest unit, you need to move into that one to satisfy the mortgage if it's liveable and then figure out how to get the tenants out.Who was your agent on this because they have not prepared you for anything? 

The biggest thing I'm seeing actually isn't his residency status, but I think you'll have the biggest issue with the value of the properties you are looking at.

The term "investor friendly" is the biggest joke!

One of my biggest questions is could I sell that second house on its own once it's built?

So I just saw this post about Section 8 HUD tenants, and this post stated something along the lines of section 8 tenants being more likely to damage properties because they're section 8 low income tenants, and also something about investors not wanting to put money needed into Section 8 properties because they think they're just going to be ruined by these Section 8 tenants, and as someone who knows the entire process with investors, owners, contractors, tenants, and prospective tenants, this is what I have to say about it:In my experience, Section 8 HUD tenants are actually better custodians of the property because of many factors, but 3 of the main reasons being, there is an annual HUD inspection that is performed on each property, so this gives the owner an extra 'protection vector' against damages, also, the initial placement of a Section 8 HUD tenant requires a passing HUD inspection, therefore there's a record of the property's initial state prior to move in, and additionally, they want to have an easy renewal voucher process annually, and their unit remaining in good condition is an incentive for those reasons, therefore they are LESS likely to damage a property - their future depends on it!