Because of that, the first layer of complexity could be beneficial due to an exit of 100-160k.  

Cities usually don't care if the OWNER lives in the basement, just tenants.You could use the extra income to offset cost of finishing basement and more.

I had another person try to bargain me down to $1700/month, and said she was moving out of her dad's house and so needed room to store boxes in the extra bedrooms. 

What I will do is attempt to find a QUALIFIED substitute tenant, credit the original tenant with the rent paid by the new tenant LESS one or two months fee for the extra work and effort, but I will NOT release the original tenant from liability should the substitute tenant default.Look, the bottom line is that renting to tenants is a business, just like any other business.  

One was making an extra $600/month while covering all of his household expenses with just 3 PadMates. 

Preapproved ADU plans offer extra space or rental potential.

After listening to him talk for close to 45 minutes, I finally said that if I have an extra $18,000 to $35,000 wouldn't I just invest that in my own property and get all of the rental income and if I sold the property 100% of the proceeds, not 50% of it. 

@Aus Smith if there is base rent and then an extra fee the resident pays for a common utility, we count that as revenue towards a percentage-based management fee. 

And we’re curious about also potentially installing an EV charger as part of this for an extra perk for guests/tenants. 

There’s a 99% chance you’re going to ask to much and sit empty for an extra month or two.