1. overestimate ARV2. underestimate repair costs3. trusting contractors4. doing anything DIY or without permits5. not counting holding costs, especially with hard moneyThose are five common ones.

And preparing a building site and installing a driveway are further considerations if I even decide to build something there.

One way to get tax benefits while you're living there could be installing solar panels or upgrading the energy efficiency of the home. 

In my devious mind, I thinking like you that I hire a parking attendant, install gates and charge an entrance fee if I bought it. 

What is the best overall water metering company you have found when it comes to ease of installation, reliability, and the cost of the equipment and monitoring?

We've installed the Moen leak detection device, which detects leaks both hot water and cold water, and monitors water usage and gives you weekly reports.

You could buy the meter, have a plumber install, you connect to computer, charge the exact amount of water usage. 

Perhaps refinish existing wood floors rather than install new LVP to save money.

I've scheduled my sprinkler install and working on the egress.  

What changes if this is an installment sale.