I'd love to talk with someone who has scaled up like this about how you structured/collateralized your loans when using OPM.It seems like it would be difficult to use private money long term with hard money loans, because it would be cumbersome and difficult to keep the money deployed constantly, running the risk of paying for capital without having it lent out.Thanks in advance for any input.

If you delead, and maintain the standard, you will be in the clear.Here's the law (emphasis added by me):460.100: Duty of Owner(s) of Residential Premises (B) Whenever any residential premises containing dangerous levels of lead in paint, plaster or other accessible structural material undergoes a change of ownership and as a result a child younger than six years old will become or will continue to be a resident therein, the new owner shall have 90 days after becoming the owner to obtain a Letter of Full Compliance or a Letter of Interim Control, except that if a child younger than six years old who is lead poisoned resides therein, the owner shall not be eligible for interim control, unless the Director grants a waiver pursuant to 105 CMR 460.100(A)(3).

It also needs some structural repair.

Their penalty structure has nothing to do with the way I paid the downpayment (401k loan).You have got me thinking however about whether it makes sense to re-look at the refi numbers and possibly take the penalty. 

Long story short, I met a mentor who is now helping me structure my deals and in these past 6 months, I have managed to acquire 6 properties.... most of which are on target to reaching our cash flow limit of at LEAST $800 per property.

What would the structure of a partnership look like in your opinion?

Lots of book knowledge on real estate, business structure, and asset protection.

Not every agent understands investment real estate and they can lead you far astray.Know your numbers and dive into the forums and info on BP.Meet with a RE attorney to determine structure and get advice on the best place to start with your financial capability.Get a GREAT CPA to ensure your tax liabilities are minimized to the greatest degree.Find an INVESTMENT banker in your area and establish a solid relationship so when you find a deal they are willing to help you out.

Second, I hope to delegate as much as possible, for maximizing the passiveness of my income structures.

Same for most common structure repairs.Also, not knowing the tool, where does it get the costs?