But right now "junk fees" are popular in the national conversation.

Surely this could be an issue with the foundation of the house soon.I reached out to the builder twice by email and once by certified mail and there has been no response. 

They will be looking at crap dollar store type properties and other junk not worth anything.DST's can give some diversity.

I sent certified mail mid september that was returned from the post office. i eventually flew drove down to the property in beginning of October to post eviction notice on garage and front door. i inspected the property that seemed half way abandoned.

I mailed a 3 day to pay or quit notice, obviously nobody was there to receive it.

Usually the service ads junk fees that are allowed.  

The rent checks are mailed a few days in advance of the due date.

I know the founders personally, and the ability to call or e-mail when I have an issue and get a quick, personal response makes it worth every penny.

@Karen Seguin, it all depends on what you are trying to convey to your tenants.At minimum, any welcome letter should provide updated contact info for maintenance requests and mailing address for rent payments, and if the legal notice address is different than lease, include that.This can also be a good way to politely remind people of any general rules that you expect them to adhere to.  

Look for off-market deals through wholesalers or direct mail.