There are times that people can't start their cars because they forgot to plug in the battery is bad. 

.$965/sq. ft.30 Battery Ln$2.53M3,200 sq. ft.$791/sq. ft.597 Beavertail Rd$7.82M5,300 sq. ft.$1,475/sq. ft.541 Seaside Dr$4.2M3,400 sq. ft.$1,235/sq. ft.4 Dewey Ln$4.05M2,700 sq. ft.$1,500/sq. ft.Step 2: Adjusting for SizeSince the planned home at 245 Seaside Dr will be 4,000 sq. ft., I used an estimated price per square foot within the market range:Conservative: $1,200/sq. ft. → $4.8M ARVModerate: $1,350/sq. ft. → $5.4M ARVHigh-End: $1,500/sq. ft. → $6.0M ARVPremium Luxury (based on 4 Dewey Ln & 597 Beavertail Rd): $7.1MSince 245 Seaside Dr is a prime location and waterfront lots in Jamestown have high demand, I conservatively estimate $1,500/sq. ft., leading to an ARV of:4,000 sq. ft. × $1,500/sq. ft. = $6.0M – $7.1MStep 3: Justification of ARV at $7.1MWaterfront Location: High demand for oceanfront properties in Jamestown.Luxury Market Trends: High-end buyers are paying $1,200 – $1,500 per sq. ft. for new construction.Comparable Sales Support: 4 Dewey Ln and 597 Beavertail Rd confirm the $1,500/sq. ft. estimate is realistic.Low Inventory: Waterfront lots in Jamestown are scarce, increasing property value.Your ARV analysis looks pretty solid based on the comps you’ve used.

The new manufacturing out at Tesla and the new lithium battery factories will continue to put upward pressure on prices and increase competition. 

So, go with a good solution on the deadbolt.Screw a lockbox in a wall near the door for an emergency physical key.Find a locksmith that can rekey the doors between tenants - put ALL locks on the same key.Most electronic locks warn you when the battery is getting low.

Huge battery plant will create a lot of jobs and conveniently located at the end of the 406.

Like accidentally leaving the car light on in the car and having your car battery dead in the morning.

Try to anticipate other potential avoidable situations with a follow up inspection to assess the Locksmith’s work and ask your tenant(s) if you can also use the time to assess for other issues such as unchanged HVAC filters, leaky pipes, working shutoff valves, working smoke detector batteries, properly working downspouts, clogged dryer vents, evidence of water damage from leaking roof, etc,etc,etc.

Quote from @Eduardo Perez-Borroto: Since the HELOC was not used on improving the home you cannot deduct the interest, nor use that to offset your capital gain.Would adding a battery bank system to my solar panels count as home improvement? 

Off grid ground mount solar, battery generator, propane n septic.

The mega site in Richmond, as well as Mt Vernon, will really change the landscape in these areas as they did in E-town when the battery plant came in play.