With an electric unit, will some say they miss or prefer the nostalgia, look, feel of real vs electric?

Electric can also be an issue in California, but it sounds like that you've checked on that...but sometimes just because a lot is infill with poles everywhere doesn't mean that the electric company wouldn't require a long amount of time to process electrical plans on their end and sometimes they end up having to replace a pole or add a transformer, etc due to additional load demand. 

Underground electric is 6 week leadtime.  

I have moonlighted for several Architects and through hard work and good fortune stumbled on an opportunity to become an apprentice electrical engineer. 10 years later I am a senior engineer, together with my wife, have a decent portfolio of Real Estate.

As per my contractors, the garage conversion seems to have been done well but I plan to have my structural engineer and subcontractors check the work thoroughly. 

The opportunity: Tighten operations around three levers—Cost, Time, and Revenue—while de-risking each flip with disciplined underwriting and execution.1) Cost: Tame Labor & Materials Without Gutting QualityValue-engineer the scopePrioritize visible ROI items: paint, flooring, lighting, curb appeal, kitchens/baths (surface updates > layout changes).Replace, don’t relocate: keep plumbing and electrical in place when possible.Use finish tiers (Economy / Mid / Premium) per neighborhood comp set; avoid over-improvement.Lock pricing earlyGet three-bid packages per trade with identical scopes, photos, and SKUs.Negotiate 30–60 day price locks on materials; ask for bulk-buy or “contractor pack” discounts.Use allowances (e.g., $2.50/sf flooring) with pre-approved SKU lists to control change orders.Build a dependable labor benchMaintain a preferred-vendor roster (primary + backup) for each trade.Offer fast pay terms (e.g., net-7 on verified milestones) in exchange for pricing and priority.Test small jobs first; promote trades to your A-list only after on-time, on-budget performance twice.Standardize to reduce wasteCreate repeatable finish schedules (same trim profile, faucet line, paint palette) so crews work faster and leftovers are reusable.Pre-kit jobs: one delivery per room (box includes all hardware, fixtures, and consumables).Contracting disciplineUse fixed-scope, milestone-based contracts with:Progress draws tied to inspections/photosNo deposit or minimal mobilizationLien waivers at each drawDaily liquidated damages for missed deadlines (after grace period)Written change order policy with price + time impact before work proceeds2) Time: Move Faster to Reduce Carry and RiskFront-load planningWalk the property with all key trades before closing; finalize scope, bids, and schedule ahead of day 1.Pull permits early; choose scopes that avoid structural or major MEP reroutes when timelines matter.Sequencing & overlapSchedule parallel workstreams (e.g., exterior/landscaping while interior demo proceeds).Use a Gantt chart (even a simple spreadsheet) to track trade start/finish, dependencies, and buffers.Daily control15-minute stand-up with GC or project lead each morning (photos + punch list).Two inspections/week: one quality, one progress vs. schedule.Keep critical spares on hand (breakers, valves, GFCIs, common trim, extra boxes of flooring).Tech + templatesSimple tools (Google Drive + shared photo folders, or apps like Buildertrend/Jobber) for scope sheets, punch lists, and photo proof.Use QR codes in rooms linking to the finish schedule for fewer “what goes here?”

Other action items are getting quotes from architects, engineers, and GCs to see if you are able to financially do this type of build out.  

Having engineers complete and back your study goes along away and minimizes errors. 

Quote from @Joseph Bondarenko: I am an engineer that would like to add investment properties into my portfolio.

California development is slow, and utility coordination (PG&E for gas/electric) can be a difficult path.