2.What are the best and most cost-effective solutions for managing this potential long-term issue?

@Hamidou Keita I would recommend if duplexes are limited if you can get a 4-5 bedroom house and either rent by room for house hack or splitting a big house into 2 and adding a kitchenette and separate entrance as a more cost effective ROI option 

dogsbite.org is a propagandist site created by a web designer who was bitten by a dog.

Instead of tying up your retirement funds, tapping into financing specifically designed for real estate investors can keep your portfolio diversified and your retirement intact.Leveraging your 401(k) is your personal decision, but framing it within the broader context of balancing risk, liquidity, and opportunity cost can clarify whether it’s the best tool for your goals.

It's a domino effect.   

@Aaron Zimmerman and clarify, I am the marketer, my husband designs lighting.

In Portland for example we are not allowed to increase rent more than once in 12 months, and it must be less than 10% increase in "effective rent".

You don’t need a judgement, but not sure how effective it would be:   https://www.rentrecoveryservic...

Syndications are designed for passive investment so the 1031 just doesn't work well with them in most cases. 

Direct communication with the builder has been the most effective method in my experience.