If they are VERY professional, they will have their processes in writing as verification that policies are enforced equally and fairly by their entire staff.6.

One big question I have is what kind of enforcement Airbnb and the Philly regulators will have in this, can they enforce it if Airbnb does not comply with them, and will this cause a major sell-off in the Philly market from investors?

That said ... even for someone like me who thinks regulation is needed for STRs, I think Denver's gone a little bonkers with its enforcement.

Hiring enforcement contractors.

It is a very unique market with some very unusal laws that can't be enforced.  

The tenant will be ordered to vacate the property, and you may need to arrange with local law enforcement such as the sheriff’s department to remove the tenant from the property if they refuse to leave.Step #8: Obtain a judgment and collect past due rentDepending on the local court system, you may be awarded a judgment for any past due rent and damages caused by the tenant.

@John Kilhafner - officially they are contractually obliged to honor the lease agreement terms, but YOU are the enforcer.

Not sure how this method could be enforced, I'd rather cloud title (ounce of prevention) than pursue through the courts (pound of cure).Well that's my update for today.P.S.

The local housing authority is not enforcing the regulation. 

@Sang Yu I do not know anything about VA, but most of the program enforce one year residency.