I re-piped the entire home (myself, with permits) from the meter in, using flexible 1" gas line and spent less than 700 in materials. 

You can also build an accessory dwelling unit (ADU) that's completely separate from the main single family home, but the permitting process in Arlington is a hot mess- my neighbor a couple houses down had his ADU permit take 13 months...so up to you on what's worth your time.

After reddit shredded my prospect properties numbers/plans they referred me here.

Do they have all utilities, what is buildable space after setbacks, do they require storm ponds or storm drainage, how much parking needs to be set aside, what is zoning or potential conditional or special use permitted?  

This is how we perform rental analyses for prospective clients.

The Airbnb has a 29-night min so it does not have a short term rental permit.

Tier 3 is San Diego, but excludes Mission Beach, and is non-owner occupied STR permit. 

Wait until the rent money runs out, then have her vehicle towed or whatever your lease/law permits. 

In some states, taxpayers are permitted to protest their tax assessment.A protest of a tax assessment refers to the process of challenging the amount of tax that has been assessed by a tax authority.

Much cheaper when there isn't electrical work or stuff that requires permits.