However, if short-term rentals are no longer allowed or become less viable, I’m prepared to switch to long-term rentals.Funding the entire construction at once is a challenge, so I'm exploring the best strategy.

Does anyone have advice for the following:Is it a good idea to explore whether to rent out multiple rooms in single-family residences for the purpose of acquiring adequate cash flow:Does BiggerPockets Pro provide a way to find demographical data on specific sources and motivated sellers?  

If you need extra funds, explore hard money financing options again.

I am exploring the option of selling a portion of my ownership to a co-owner (around 20-30%).

If you don't want to buy another investment property because you're too busy with work you should explore other investment opportunities that would give you potentially better ROI. 

I am wondering if there are alternatives that I can explore myself without incurring that expense.Your input will be greatly appreciated.

Explore my personal favorites, Set For Life by Scott Trench or The Total Money Makeover by Dave Ramsey, for invaluable financial insights.3.

It feel outside of my scope of my business model.A few suggestions:- List on CHBO corporatehousingbyowner.com- target a niche market like students, travel nurses, flight crews (if you're anywhere near an airport), and construction teams- if you have 2 - 3 bedrooms, explore renting monthly by room - roomies.com and bungalow.com; you'd be surprised at how many people are on a budget and will roommate with strangers. 

It might also be worth exploring markets where properties cash flow better under current conditions, even if it means adjusting your investment criteria.

I'm guessing you've been exploring conventional financing which is why you're finding a cash out refi difficult with the property being in an LLC.