.)- 10% for future property management -10% for vacancy-10% for CapEx-5% for repairs and maintenance-5% for lawn and grounds keeping-0.5% of purchase price for PMI based on my credit score For a house hack, is this too conservative?

Home depot/lowes sells mold test kits you can use once the basement is dried out.Once you have the basement dry, the next order of business is to figure out the cause(s) of the flooding, and hopefully address those causes to prevent future floods.There are multiple potential reasons for your flooding--it could be ground water rising up from underneath the house, it could improper drainage around the house, it could be cracks in the foundation or slab, it could be water coming in through the window wells, it could be all of those things, or it could be something else entirely.  

To get the boots on the ground/shoulder to shoulder education they will want to put you on a team.

I assume that since it is new construction, over time the ground settles and could probably be the root cause of this. 

I am trying to decide between doing the BRRRR method while living in one half and renting out the other or building a duplex from the ground up.

Start with something either turnkey or light value-add, so you can start forming your boots on the ground team with less pressure and risk.

I've done complete ground up rehabs to simple paint and floors.  

After maybe 8 hrs of work with a helper, we had the new mast, two ground rods and wiring hooked up. 

It can be awkward having to tell them to keep it clean so you just set ground rules in advance.

Will be breaking ground on a few projects in LA and Joshua Tree area soon.