What is your rate, term, LTV, and rent?  

When you say your house hack phase has passed, are you saying you DON'T plan to occupy a unit of the 4-plex?

You will need a local attorney to close on a house.  

The cost of labor , materials , property taxes , inflation , interest rates  etc .

Consider house hacking when rates and prices are a little more balanced with reality.

Quote from @Gregory Schwartz: Quote from @Jay Hurst: Quote from @Gregory Schwartz: I just read this article from Redfin (Housing Market Predictions for 2025) that predicts mortgage rates will stay at 6.85% in 2025.That seems like one of the few predictions saying rates will stay that high.

To Sum it up, its a good idea if you can exceed the cost of capital (higher rate than your cost of debt) with what you earn on your heloc/debt you pull out and invest.The question is how much gains above is enough to substantiate the risk of your variable interest rate, well thats up to your personal investing criteria.

Because you are forcing equity into the house you are sometimes able to pull back out the entire purchase and rehab process to return to your investor then you own the home with just the mortgage.

Renting out a room is a great way to get started, and I wouldn't get too settled into the "going rate" use that almost as a floor. 

That helps some...but your variable expenses also go up too - property insurance & taxes - so a lot of your rent increases go to offset rising variable expenses.I started at the age of 47 in 2018 and we bought properties fast and furious - 12 the first year, 10 the next, and 9 in 2021 and currently have 38 properties.