I saw on tv once that they used a jackhammer to grind the crack down and out, then they poured concrete, and eventually a leveling agent was used.  

There are some who think a new wave of crack down on this type of activity might come but we haven't seen it yet.  

Chances are you likely wouldn't have a problem or get audited using a "residential cost seg" until the IRS decides to crack down on these providers, but it wouldn't be fun to be the unlucky one who gets to be their example. 

Sessions in particular is very anti MJ.I can easily see a situation where the feds crack down and civil forfeiture rules allow them to seize all the real estate involved.

They'd crack down quickly.   

Seeing lots of tourism-centric cities crack down on short term rentals and fining landlords obscene amounts. 

The whole service dog/animal thing is getting out of control and I think they (political officials who make the laws) need to crack down on it some...but that discussion is for another day. 

Will be interesting to see how this plays out as the trade wars heat up, snippet of the article below:Chinese investors have become net sellers of U.S. commercial property for the first time in a decade, reflecting China’s crackdown on foreign investment and growing tensions between the U.S. and Chinese governments.After years of binge-buying trophy real estate, Chinese investors sold $1.29 billion worth of property in the second quarter of 2018, according to data firm Real Capital Analytics.

Our initial sewer line system inspection showed that there is at least on crack down the sewer line system.

The Trump administration is slowly moving in the direction of a crack down on marijuana.