Hello,I'm looking for a little advice on which debt I should reduce.

You could adjust the scope of work in another way to reduce the costs to compensate for this addition perhaps by using a cheaper flooring for example.

It may reduce the payments.

Hybrid StructuresYou can also blend some of these terms to create more flexibility: Monthly Interest + Lump Sum: You could pay a reduced monthly interest rate (e.g., 5%) and offer a lump-sum bonus (e.g., 3-5%) at project completion.

Lots of newer neighbourhoods have detention ponds built to reduce the amount of water going into the storm sewers during storms, so I wouldn't worry about it. 

Insufficient reserves result in vendor bills piling up, value-add strategies running behind schedule, and returns being reduced, so it's important to have a clear picture about how well capitalized or undercapitalized a deal is so that you can truly assess the risk.

Great news for some, the loan will be a portfolioed loan and they are probably insuring the portfolio and reducing risk, but other underwriting guidelines would be interesting to see.

Whatever criteria you adopt, be sure to stick to it.Find a lender that you can shadow or work with if you would like to cut the learning curve. 

Consider hiring a property manager next time if not just because they have the tools and processes to reduce the risk of this and move quickly to execute on a problem.

Instead I would look into shadowing different careers in real estate.