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?  

You will want to get multiple quotes from different lenders so you can see for yourself the numbers.

Investors here are looking for agents who invest or work with multiple investors who would give you a recommendation.

I can't speak much about the Pittsburgh area, but I own multiple properties here in Columbus.

I know it'll take more than 1 postcard sent out or one call made and I know I need to make multiple "touches" over a month or two to truly get engagement.

There are multiple ways to do this, I personally have sent out direct mail in a few different fashions, and cold called as well.

I created multiple LLCs using a registered agent company for $200 each.

Doing anything at scale would likely take an act of congress, decades of litigation and environmental reviews, multiple huge overlapping federal bureaucracies working together, not to mention much of the available federal land is not useful for building housing on as it's in remote areas far from jobs with no water and sewer access, roads or infrastructure... so easier said than done. 

@Max BellinoHolding company is really not needed unless you run multiple operational businesses like a property management firm, construction firm etc that you want to roll up into one entityHaving a holding company that holds one company you that owns real estate would have me question what’s the use case?

For rents to increase faster than inflation, there must be significant and sustained population growth.Sufficient income to replace your current income: This will require multiple properties.