If you would like to continue to operate as a short term rental, you will need to submit a new STR application for this property and must go to the Board of Adjustment and be granted a special exception for staff to approve this request for a Type 2 STR Permit.The Board of Adjustment consists of eleven (11) members; you will have to get a concurring vote from nine (9) out of eleven (11) members in order to be granted the special exception.

It has surprised us delivering nearly $60k in gross revenue annually.

Honestly once the doc was signed, most of deal was on me to deliver. 

While not being specific as to why there were delays (except what we know-that there is a wait on the process of a national builder buying out properties), she said they were temporary delays recently and that they were not permanent.   

Are STRs in this area still delivering strong cash flow?

Except you insist on giving the OP a "yes" based on the generic strategy (A) while I insist on giving him a "no" based on his specific situation (B).To answer your question to me - no, I'm not trying to be controversial.

The very first day that a tenant is late, a Notice of Default needs to be delivered to the tenant (you need a receipt of delivery; if you hand deliver it, place it in a sealed envelope with their name on it marked 'urgent/confidential' and take a photo of it placed on their door). 

And because there are so many, demand is ultra low, except in the busiest of months.  

We specialize in short-term rental investments through our integrated real estate, mortgage, and property management services, delivering expertise at every stage of the process.

I believe that you don't get returns (failed to deliver) with bulk mailers so you don't know which addresses are bad.That's the simple stuff.My advice is to do various mailings that you or some prepares locally, that go out immediately, using 1st class postage.