Some people like the 1 LLC per property since its common to name the LLC the street address for the property. 

506(b) is quite common if you have a preexisting relationship with investors and do not need or want to publicly advertise. $150-250k is a pretty small raise for a syndication, though.

The most common portfolio style loan in Texas is a 20 year adjustable rate loan.

Is it common to just put the rates up to what you wish on buying the property.

Does each family member own an undivided interest as tenants-in-common in the property or is it owned inside of an LLC or other entity? 

In regards to inflation in your commercial leases, there is a clause that is commonly used called "Indexed Escalation."

Does anyone here know what are the common problems that a host has to expect in doing Airbnb hosting?

Seems like this is not a common practice, but I am not sure why. 

I continually forget about this because it's not too common but I'm glad I posted the actual verbiage above - WHEN LOANS ARE SECURED BY THE BORROWER'S FINANCIAL ASSETS (meaning a 401k or brokerage account), MONTHLY PAYMENTS FOR THE LOAN DO NOT HAVE TO BE CONSIDERED.....meaning, we don't hold that payment against you.  

This is a common issue and it's because you're not filtering anyone out.