If he has a financial statement showing the profit and loss that would be helpful.

Knowing if it is an estate can assist your search and also prepare you to be sensitive to the emotional loss of a family. 

Yes, I lost 10% over the last year or so like everyone else, but I'm fine with that, because I believe that over a lifetime, my strategy is likely to produce that 10-12% annualized (nominal) real return that index funds have historically provided.This won't work for everyone, but if you can accept that you are doing the statistically right thing with your money, you can swallow that 10% loss, knowing that in the long-run, it will probably be the correct place to park your money.My strategy is simple.

That was the pill that was sold. 

Municipal regulators will always look to the titled entity for impairment corrections because ultimately its the owner that has the most to gain/loss should conditions present dictate changes.In the situation story, and in most instances in the NYC marketplace, landlords will need to incorporate new language into their rental/lease contracts that prohibit and AirBnB use, and furthermore pass on the financial liability for any breach to the tenant.In no way shape or form should the temporary on demand tenancy have any liability for building or use infractions resulting from their rental. 

They shop your policy around and get you a better rate, and you're not paying for the large advertising budget of the big companies.My policies obviously insure the building itself, but also include liability coverage in case someone were to get injured on my property and they also include loss of income coverage.

But, as with any investment, the danger of loss is real and timing is everything.

:P  I travel a lot too, which is a personal win but a financial loss (I hardly have savings) and I'm thinking... maybe I want to travel and flip?

For example, the loss of property, human resources (have any employees?)

You need to factor that in along with an anticipated vacancy to come up with your estimate of rent loss.