Here's a map -- select "Qualified Opportunity Zone Tract" on the "layers" button --https://www.cims.cdfifund.gov/preparation/?

Having the indemnification clause in the contract provides some layer of protection, but nothing stops anyone from suing anyone else.  

I started with a regular mask and after 30 seconds I was on my way to the Home Depot to get a full professional ventilation mask.It wasn't just rat droppings.

@David NewfangThere are a number of self-directed plan formats offered by different types of providers that suit the needs of various portfolio types.A custodian like Entrust is simply the base administrative/processing layer. 

It's one of those that's not expensive to install, indestructible if you get a good wear layer and overall looks good too! 

To mitigate these risks, I recommend the following key management system we have evolved overtime:1st - Secure the entrance of your property: This should be the first line of defense against unauthorized access.2nd -Utilize a digital lock code: This can be installed in a closet if possible, and will provide an additional layer of security.3rd- Install a key-coded key box in the closet: Choose a key box that is secure and not easily accessible, such as one that is bolted to the studs and not installed in drywall.4th- Utilize a key ring with a tracker: Keys can be labeled with coded labels, and a tracker such as an Apple Tag or Tile key chain can be attached to the key ring to help prevent loss.5th - Label individual keys with codes: This will help prevent unauthorized access in the event of theft or a key breach.

Your standing here, hocky mask n gloves on, bragging about the giant bag of loot slung over your shoulder how ya just robbed the landlord's for 20%..... 

We did not even have the ability to aupple millions of masks, MASKS that cost 10 cents!

@Brian Mihaljevich another layer to the question is: What if you buy a home with an existing ADU?

And doesn't your last point sound good...another city worker to deal with and another layer of paperwork...joy!