That might be more regional banks since they're balance sheets have been under fire the past 2 years because many commercial asset values have dropped so getting 25% of the loan they give you back in cash deposits help them balance their books a bit more.

Let us know if there's anything we can help with!

I had a real estate agent to submit the deal for me and help get everything closed.

BiggerPockets recently released a tool to help real estate investors find an advisor, which you can check out here.

I know the specific market is a factor, but are their key numbers or ratios (like the 1% rule) that you have found to be meaningful or helpful, obviously the numbers would be different for a turnkey vs rehab. 

I think that this could be a great way to find people I could help get their homes sold by assigning them to a contractor/investor buyer.

What are some things I should consider with this deal that will help me scale my portfolio in the next few years?

There are many resources to help you make the most of your property, and if you visit often you'll know what's happening.

So my question: Would I legally be able to keep the security deposit to help cover the water bill, given that we found the faucet on previously?    

Crystal River has been on the upswing, but you are at a good time to be looking in Florida because a lot of areas are on the pricing downswing which could help find a two-family.