A neighboring commercial building owner is interested in installing a grease trap on my property and paying me.

We just installed a large culvert for $20,000; they can add up.  

My dad, a dedicated DIY-er, taught me when I was in college, and I just kept learning.  

Remove and install surround .

I am sure if you were going to install a couple of windows they would give the homeowner a permit to do that, but it sounds like you are doing quite a bit more work.Every city and county is a little different.

ALL LVP is waterproof, it's the INSTALLATION that is water resistant.

You can usually find them at most home improvement stores, and they're fairly easy to install if you're doing it yourself.

One flooring contractor is offering to install a 2mm mohawk Luxury Vinyl Plank that glues down. 

Before it was rented I added kitchen cabinets and a counter where there was none, remodeled the bathroom (not a complete makeover, but substantial), added a dishwasher and installed flooring.  

I usually do some of the work myself such as demo and painting and installing appliances and basic wood work and trim. 9K Closing costs (includes a right of redemption bond and 1 point to lower interest rate to about 7%) with payments around $1000.