Looks many discussion and not uncommon, for example:https://www.biggerpockets.com/forums/52/topics/92456-property-manager-wants-to-be-additional-insured-or-co-insured

It is not uncommon for a tenant to keep their needs and comments to themselves until they see us in person.

Aloha,Although I am not familiar with Denver's laws, it is not uncommon for States to have a requirement that you work under a Broker, who also has the actual Business license.

We've all heard of SF tenant buyouts costing over 100K - it's not uncommon.

I don't get excited about that by any means but that's not uncommon for OOS investors. 

It is not uncommon for STR's to host weddings but to your point some of them are doing it without the proper permits so it becomes a situation of "Don't piss off the neighbors" and no one will know so they do not get shutdown.

Dirt ( sand lol ) is not uncommon down here for roads in the more country / acreage type settings.  

But it is not uncommon for them to have a contract for 4+ months.

But the contingency might be written such that the seller can cancel the contract if they don't find a good replacement.This type of contingency is not uncommon. 

@Brandi Scharrer It is very uncommon for a bank to take projected STR income into consideration for refinancing; appraisers will almost never consider it, and that is the opinion the banks will rely on.