When I see things like "our research shows" it's a red flag for me that the information is theoretical which may or may not be helpful.

That’s a huge red flag for me.  

Each LLC can have a separate agreement, but the IRS will scrutinize this, so keep everything above board to avoid issues.Tax Implications: This arrangement could allow you to shift income and claim home office deductions, but it needs to be done carefully to avoid triggering any red flags with the IRS.Renting a Car to Your LLCs:Renting your car to your LLCs can also offer some tax benefits, such as shifting income and potentially deducting expenses like mileage and depreciation.

(see the red circle below)

Quote from @George Red: A hypothetical to see how people factor costs when rolling equity forward into additional purchases.For this example assume  you purchased property “A” for 100k, and put 25% down. 2 years later you sell it for 125k so you now have 50k (25k from your initial down payment + 25k in equity).

@Geremy RosenbergLots of red flags but no deal breakers for me personally.

The rental income minus the mortgages has me in the red around $450 a month.

They could not even find the root cause of the leaks we had the last few months (when there was heavy rain). 

Too many red tape bureaucracies, local staff challenges, building management issues.

Red state.