Ask property management companies - you can reference a property you are trying to buy and get opinions from property managers, and sometimes they will even tell you how much rent can be collected5. 

Companies like Vacasa or Evolve can help but might charge fees.

At one of the meetings I learned that there is almost one insurance company covering Florida, Citizens. 

If you go through a PM Company or Real Estate Agent they can add the listing to the MLS.

Talk to Phila Water Dept directly about this issue.If you purchased it recently and randomly got a bill for that amount, it is likely the title company had an estimated reading and not an actual reading of the water meter.

Do you have recommendations on property management companies?

Also, wondering if it makes sense to look for companies offering loans under 75K of property equity, or is it typically better to consider private lenders?

I believe there will be pretty high appreciation here, as many large companies are investing money in our area such as Intel, Google, and Amazon.

They also have a GP who owns a construction company that specializes in apartments to do the renovation.

Third property was through owner-financing that we will pay off in six months using the combined rental income of all three properties.Our goal is to become a self-funding investment company, where the rental income pays for all new properties.