Authorities are investigating this as a potential terrorist attack.

They asked for more—$15k to be exact, after not even being authorized to live there and or bothering to work things out with us all year; apparently, the John Doe in the house has PTSD and just finished dialysis (neither of which we knew since they never talked to us!)

Each housing authority (HA) provides a voucher amount determined by bedroom and some further define it by zip code or city within their covered area.

I don't know because I never heard anyone in authority address the reasoning honestly. 

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Your town may have just undergone a comprehensive reevaluation which adjusts the property values of the whole town.

I attend seminars, and real estate meet ups, as well as work with my local housing authority to keep up with the local tenant landlord laws. 3) We did all of our own maintenance.

Actually, to allow access it is an authorization. 

Taxing authorities have had their eye on vacation rentals as a huge, new found pot of gold.  

The Housing Choice Voucher program here is run by CMHA (Columbus Metropolitan Housing Authority).