There are programs that will also auto-flip to owner's account to avoid shutoff and these resulting situations.In addition to @Nathan Gesner great advice, you should check with an eviction attorney about how to legally keep the tenant from returning to occupy the property or pursuing eviction as necessary.

Additionally, I am seeing a lot of STRs now being advertised as MTR or LTR.

It really depends on how long you plan to hold and what your long term goals are with acquiring additional properties.  

Additional information: rZoning permit from 1/16/1956 with a variance granting this as a 3 family unitI have no building permit saying this allows this as a 3 familyI am asking for any advice specifically for Philadelphia, PA.

Additionally, are there any other rules of thumb or key indicators you would recommend monitoring to ensure operational efficiency and profitability?

If you are referring to ocean front structures, there are additional CAMA rules in place that go above and beyond the flood rules for renovating a structure located within or forward of the oceanfront setback.

In a few years I was doing some big commercial RE syndication deals which is now what I focus on, in additional to some JV opportunities.

In addition to the areas named by Jay, I would personally add Scottsdale, AZ, Columbus, OH, Richmond, VA, and Cleveland, OH.

I also designed it and sited it on the lot for an easy addition if one wanted to add bedrooms and additional living area.

Maybe I will get a bunch of cheap bikes and just throw them away every time they break 😂 Pretty sure I can find ones under $60-80 from discounted stores.