He also put in infrastructure including paved entrances and all the water/plumbing for the land.

I would suggest looking for a home you can convert the basement to a 1 bedroom apartment with kitchen and separate entrance if you are looking to maintain privacy. 

I’ll be comparing graduation rates, percentage of graduates who meet UC/CSU entrance requirements, total students, students per teacher, college-going rates, test scores, and overall website grades.

I'm going to assume you don't want to live in the same house as the renters, meaning no separate entrance? 

However, we have much more control over our entrance and exit finances than in a 401k plan. 

Are fire rated doors required for the two exits, and apartment entrances?

One of the repairs required by code is that the entrance doors for each of the units need to be at least 60-minute fire rated, but I am having trouble finding a store that supplies this for an interior wood door.

He kind of overbuilt for the neighborhood and his contractor went over budget, so he moved in himself and did a STR in the Master bedroom (which has it's own entrance). 

They can squeeze through small holes for sure but there shouldn't be any small hole entrances into your home.

Here is the basic timeline:- Purchased property in late 2019 for $490,000- Property was a 2 story 4 bed/2.5 bath house with a full unfinished walkout basement- Premium for the property compared to one without the walkout was somewhere around $30-40,000- Basement was around 1200sqft unfinished space and the apartment was best setup to be around 800sqft- Started initial framing in early 2020, but COVID put a stop to some plans due to cash reserves becoming more important- Project was on hold until late 2021 when framing resumed (all framing was done by me)- Jan 2022 had a tankless water heater installed (had 20 year old tank already and don't want to run out of hot water with tenants) $3500- Jan 2022 had main electrical panel upgraded to 200A setup and also had 100A sub panel installed in basement and charger for car in garage $6000- Feb 2022 finished 95% of framing and GC began plumbing work- Feb 2022 HVAC work began (We installed a fully separate Mini Split Heat Pump for the unit) $5,400 for all fans and mini split install- March 2022 Electrical Rough In was completed- March 2022 Rear Door (Entrance) was swapped from a small slider to a full 36" exterior door- March 2022 Passed rough inspections and given the go ahead for drywall- Late March 2022 Drywall install completed- Walls are standard 1/2" single sheet- Ceilings were done in the following order for sound insulation (Fiberglass batting, resilient channel, 5/8" drywall, Green Glue, 5/8" drywall) $7500- April 2022 Primed all walls and ceiling- April 2022 Carpet and Vinyl flooring installed- April 2022 Trim installed- April 2022 Kitchen cabinets installed- Mid April 2022 Interior doors arrived and were installed- Mid April 2022 Shower pan was built out- Mid April 2022 Butcherblock counters cut and fitted with sink and oiled- Mid April 2022 Puck lighting installed- Late April 2022 Appliances arrived- Late April 2022 Painting continues (biggest regret here was not hiring a painter.