The term "shady manager", in my opinion, is withholding pertinent information or being misleading in order to lock owners in to a contract and then take advantage of them. 

A lot of agents withhold the sales price along with other information.

I've read that some people will withhold the final 10% or so until all work is completed.

The problem is that a million people have registered companies with “holdings” or “investments” or “group” in the name.

He's withholding rent right now saying I need to cover half his bill since his heating costs are going towards the upper unit. 

Whether you’re within your rights as the managing member to withhold the information is immaterial in the grand scheme of things.

Most of the clients I've worked with as a Realtor are investors and I've already spoken to them about partnering up and helping out with the financial aspect (Hard money loans), I can handle finding the deals and working with the GC's.I am really excited to get started on my real estate investment project, but I am struggling with calculating the costs associated with holding the property.

If anyone has been through a similar situation please advise.Below is the hypothetical example he createdPerson has income from a job (W2) He and his spouse  have a LLC with holds their multiple real estate rental properties.

At the beginning of my journey, as a real estate investor, I was struggling with the construction cost and felt I was always tied to the budget, and together with holding costs and my life expenses I felt Iam was always tied to the budget.As time went by we learned how to use CC the right way to leverage our investments and increase our ROI, Then started helping other investors secure capital in 0% interest for 12 months.  

great way to loose friends if a tenant causes damage or moves out before 3 months is up and you withhold your fee.