These are some excellent ideas!

They are currently working on legislation that requires new developments to have a certain number of affordable housing units with "homeless preference" for tenancy. This would mean that the landlord can pull from a number of people currently GA in housing/shelters. Existing landlords are pushing back on registering existing units as they fear it will turn into "rent control".

I love the idea of employee housing. The few THP hotels that have been able to meet guidelines, I found are currently employing residents. It appears to be a win-win situation for the most part.

There are currently some funding options for Accessory Dwellings, I don't believe there is a tax break though. An accessory dwelling can increase property taxes, and running utilities to the buildings can be in the tens of thousands of dollars. There is not much incentive for people to actually take advantage of doing this.