Would the federal tax liability be $140k at year 5 for the sale, with long term capital gains (ignoring any Net Investment Income Tax)?

I assume your prop tax increased 1.1% to 1.2% of the ADU cost even though the ADU only valued at $75k???

The article also fails to mention that overall transaction costs can actually be higher in countries where commissions are lower because the agent plays a different role, and due to needing to pay a lawyer for paperwork that agents complete here as part of their job (called a solicitor in Britain) plus VAT taxes and other closing costs need to factored in on top of the sales commissions, which we don't have here, overall costs can actually be higher even if commissions are lower. 

Unlike a mortgage the interest on your loan will not be tax deductible.

Here are a few things that I like about the neighborhoods in Indy compared to other states: high rent-to-home-value ratio, consistent and gradual city development, relatively low property tax and insurance cost, affordable renovation service cost.From my experience, it's possible to find deals that meet 1% rule if you invest in *turn-key* duplex or SFH here, but they are harder to find, and could potentially slow down you from scaling up.

@Nicholas Haubner Contact Montvale's tax assessor and building department to see it is currently classified. 

I highly suggest you use our marketplaces to find trusted, investor-friendly team members: Tax Pro finder: https://www.biggerpockets.com/business/finder/tax-and-financ...Lender finder: https://www.biggerpockets.com/business/finder/lendersProperty manager finder (if you go that route and don't self manage): https://www.biggerpockets.com/business/finder/property-manag...

For instance, property tax & insurance expenses.

We keep good books, have legitimate and good tax returns and can show tangible real income on these units.

I think a good tax person is worth their cost.