I work full time as a county mechanic and currently mortgage my home.

Currently, the penalties for cancelling a guest without good cause (like an urgent repair/mechanical issue) involve stripping you of any Superhost/Premier Partner status you may have (for a year, with AirBNB - which is a Big Deal to me) and dinging your search ranking.

True with every profession, from car mechanics to surgent.

A contractor has time to record a mechanics lien, what if they did not sign lien waivers and then file after the foreclosure. 

Not to say real estate is quite as dramatic as consumer goods, but you see the flips that sit on the market because they are over improved and asking too much, or the design doesn't cater to the typical buyer in that neighborhood, or the flipper only handled aesthetics and didn't address major structural/mechanical needs because they didn't know those issues would kill the deal on inspection.You also have to realize that all these "strategies" have been around forever.  

And that's how the zoning is being used as an enforcement mechanism. 

That's like asking how much it will cost to fix your car that broke down in every city, without a mechanic ever seeing the car.   

Natural Finish - after removing stains chemically or mechanically, mix 1 part Tung Oil, 1 Part Mineral Spirits.

Once I was out the materials and time, I didn't have the money left to pursue a mechanic's lien because that is an expensive and timely process.

Because the tenant is not responsible for the mechanical features in the building, the landlord retains the right of access with notice.