The general plan is to BRRRR a duplex and rent one unit while living in the other.

For example, a duplex that's on the market is selling for $440,000 and the tenants are currently paying $850 per month and are signed until next July 2025.

Purchase price: $665,000 Cash invested: $200 Sale price: $665,000 Its a Duplex 2bd1ba each unit, nice backyard and long driveway, situated in the Pattern neighborhood 5 minutes drive from Dimond/Laurel village.

You're right but $40-65k is still relatively cheap when you're just looking to buy something out right in cash without having to use a loan at all when that amount is probably your average downpayment for something around $200k for a duplex in other neighborhoods. 

dude, we're building our first duplex and are saving $7000 by NOT using HVAC.

A half duplex in the Calgary suburbs where I live sells between 500-700k. 

I started my real estate journey 2 years ago and bought my first duplex fully rented.

I only own 2 duplexes, live in half of my second once. 

Purchase price: $273,000 Cash invested: $60,000 Sale price: $375,000 Purchased the property with a "subject to" agreement, did a cosmetic renovation, cleared outstanding condo dues, and resold the property.

For example, a few years back, I was working with an investor who wanted to break into the Phoenix market - a solid choice, by the way, because of the rental yields—and we ended up uncovering an off-market duplex that wasn't even on her radar.