At first, I wanted to passively supplement my income with rental properties, but after thinking about it I want to actively invest and build a portfolio.

Begin increasing monthly income to supplement day job.

Ball valves are cheaperBooster-seems to be just for supplementing, not clear if it can heat by itself?   

Schnapf  I agree 100% whenever there is an environmental issue with a property and the state will fund or supplement the remediation, its worth going through a little extra red tape!

If you have some money to work with, even though the market is competitive you can find something that is a great investment and can supplement your income, allow you to live "Rent free", and sooner or later cash flow.

Purchase at least as much as your net sale (contract price minus closing costs and commissions)You can use your own cash to supplement. 

I've gotten some leads and closings which has supplemented by existing book of business but definitely by no means mastered it.

Goal to purchase first property in next 12 months and really focused on LT wealth and retirement supplementation.

Treasury’s Coronavirus Aid, Relief and Economic Security (CARES) Act and the Coronavirus Response and Relief Supplemental Appropriations Act of 2021.

Definitely took notes on the possibility to use the duplex to supplement the loan (if I understood correctly, the bank could factor the rental income from the duplex into the loan).