Would a cash-out refinance to free up equity and keep growing be a smart move, or should I focus on paying down my existing debts?

What is the best way to best way to deal with the existing tenants? 

In 2025 does it make sense to build a 4plex and house hack it or is it better to buy existing multi-family? 

For existing properties, you must make substantial improvements (equal to the property’s value, excluding land) within 30 months.Ensure the duplex qualifies as an OZ investment and complies with QOF rules.

Many European cities have existed far-far longer than the USA has even existed.

What is quality of all the tenants on existing and potential?

Leverage your existing equity to invest in smaller properties, such as a mixed-use or retail space, to gain experience and cash flow.

I'm not sure if the program is still going on, but has definitely revitalized a lot of the area when it was once destined to follow the way of other older cities that are aging out of existence both in terms of people and property. 

Doesn't exist in Canada.

Buy an existing house to live in and add an ADU in the back.