Often 75% of the labor budget on small repairs is draining and refilling the sprinkler system which you will have to do on your five year anyways (where there's a fire department connection at least).Finally, go to NFPA.org and register.

Not familiar with your specific town, but the building department should be able to answer your questions.

Go into the Building Department/Planning Department and confirm that a Three Family "Use" is allowed in the zoning district and ask what the process is to convert it.

If you need help, go to the city housing department and have someone help you.

I got a call from my Tenant saying that there is no water running at this time (4pm on a Friday) I called the water department and said if they received my payment and they have, we are current.

In general I would recommend speaking with the planning department for whichever city you want to build the ADU in to get confirmation.

Here in Kansas, the health and safety inspections of motels is done by the Department of Agriculture. 

My day to day job is a Detective with the local police department.

We had the fire department do a holiday safety talk last October, a driver's training instructor did safe driving in poor weather, with a video. 

BTW, we rent condo for around $1300/month, so if someone departed 5 months early, that would be a $700 fee to them plus they own the lease payments until we find a new tenant (see below).We also ask them to sign a document that states they are breaking their lease early and they are responsible for the lease payments for future months of the lease until we find a new tenant.