In San Diego, they recently applied STR quotas.  

My comments were more directed to those that simply paid too much, are under current financial pressure, and not sure what to do next.

If during the next 2.5 years, the owner redeems the property i get the money + interest back, but lets say they do not redeem the property. 3)  Within the last 6 -3 months of the expiration of the redemption period, I will file a petition at the circuit court for the tax deed 4)  At the same time, after filing the petition for deed, I will need to send "Notice of Expiration of period of Redemption" Take Notice to the county so they can mail it to the home owners and any interested parties informing them to redeem asap. 5) I will subtax early the following taxes as soon as they are generated by the county. 6) Inform the property owner in three ways, certified mail from the Circuit Court Clerk, being personally served by, the Sheriff’s office; and notice being published in a local newspaper. 7)If the taxes are not paid and the last date to redeem passes, the tax buyer can apply to the Circuit Court for an Order directing the County Clerk’s office to issue a tax deed to the tax buyer.

What are the requirements and what height are the buildings and this applies to?

The 5-Year Treasury rate is generally the right benchmark for non-owner occupied Non-QM (assuming thats the direction you are in) - and rates will generally move in concert.I'd be happy to look at your scenario and let you know opinion on if its in line with current rates - that being said, economic data has been brutal this week and yields have risen every day, so its unlikely that rates have gotten better since you locked in last week (if you got a true rate lock)

I follow him on twitter, maybe ask him for a direct referral?

I'm going the FHA house hack direction with real estate investing and have been pre approved.

If the property manager is named on the contract, then the property manager can represent the owner in court.This may not apply to your situation, but I highly recommend you read the law or speak with an attorney to understand your options and which method is best for you.

Meet with P&Z to see if it’s possible to apply for a variance or getting the property rezoned.

You can also always try direct marketing campaigns or paying for leads (absentee owners, probate, etc) and marketing to those homeowners, as well.