I found that they replaced vinyl in sections rather than the whole floor and used a different style and color to do so.

SFH suitable for families were challenging in maintenance/upkeep expense and in getting market rent. 

I know that a legal description is typically used in contracts, but I'm having trouble getting ahold of the legal description for the properties he wants to sell, so I was wondering if it would be suitable to use an APN (parcel number) in place of the legal description.

There are some older styles of pipe that break down over time and today’s codes may make replacement unfeasible.  

The foreclosure sale is the auction style sale that takes place "at the courthouse steps" or other suitable public location.https://www.nolo.com/legal-encyclopedia/california...If there is equity, you may arrange a sale with the owner like you would any other typical real estate transaction.

Same style of house, bedrooms, baths, square footages, school districts.  

If I were to use my SDIRA to:1) Invest in a private equity style fund that is making hard money loans to house flippers.2) The only income for the fund and investors is interest income on the loans.3)The fund is set up as an LLC Partnership in which each investor has an ownership stake. 4) Then the fund began to use a line of credit in addition to the investor equity.

We would provide contractors to renovate and rehab the home to a state that's suitable for the buyer, we also can provide coverage plans on appliances and the general rental maintenance.

Its an old style house converted into 3 units.

Go to a REIA meeting and ask the organizer if they can point you to some people that are interested in the same style of investing you are.