Since it's 2024 and costs have gone up, I would increase those numbers to maybe $40 (small dog/cat) and $50 (larger dog). 

If the 16 unit complex is cash flowing the same as the 16 units comprised of quads, but the 16 unit apartment complex is half the cost, it sounds like the half cost option is far better. 

Interior and exterior renovations and improved management plan in order to increase rents closer to market and mitigate expenses.

You will receive most if not all your benefit in year 1.Year 1 is where you will spend money furnishing the house and potentially taking bonus depreciation via cost segregation study.Year 2 and onwards, assuming you got a performing asset is where things will reverse tax wise and you will likely be reporting positive taxable income.

Do have a property manager or self manage?

and from what i understand, you can self manage these days

Imagine you sold for $10.5M, paid $500k in commissions and closing costs.

For this cost, $350 for the plus, I am extremely disappointed.

And there are also leaks coming in at the corners of the ceiling from the water management. 

It shows you from beginning to end on buying/flipping/managing defaulted mortgage loans from banks.