They have a system that tracks this exact thing, so an investor can see exactly how the investment is performing.  

High performers everywhere swear by it.

I recommend people only sell if (a) you can invest the capital in something that performs better, or (b) it aligns with your goals.

How do I know which questions to ask to ensure the property manager is performing at its best?

Owners mistakenly ASSUME all PMCs offer the exact SAME SERVICES and PERFORM those services EXACTLY THE SAME WAY, so price is the only differentiator – and they often select the first PMC they call!

I currently own a successful short-term rental in Fort Lauderdale and have identified a new property nearby that I’m confident will perform well.

Handle Legalities:Make sure you have all the permits required for the task you intend to perform.

Past performance is not an indication of future results.

While I don’t plan on flipping the house, I intend to use the property for short-term rentals (STR), and based on my research, it seems like it will perform well either as an STR or a long-term rental (LTR).Any ideas on how I can source the financing or recommendations for better lenders would be greatly appreciated!

You mention you would also share in losses, but you aren't investing any capital so poor performance would lead to your partner realizing a monetary loss before you.