I've opened two additional LLC's with them since I last posted here.

Additionally in terms of a GP/ LP relationship, would preference of LPs create the same dynamic in choosing one GP/Sponsor investment over another, if all technicals and numbers are the similar between two investment?

I think they contain solid information and will help lay a good foundation as a beginner (Haha, I'm completely new to real estate as well, btw)I'm also going to be reading the following books, and hopefully I can finish all by the end of this month:1) The ABCs of Property Management2) The Advanced Guide to Real Estate Investing3) Long-Distance Real Estate Investing How to Buy, Rehab, and Manage Out-of-State Rental Properties (this might be the most important one to me personally)4) The Book on Investing in Real Estate with No (and Low) Money DownIn addition to reading, I'm consuming crazy amounts of youtube videos, and I'recommend you do this as well.

*Older systems contained insulation with additives that may oxidize copper wire. 

This is straight from the CFPB website: "Additionally, for 60 days from the date your loan servicing transfers, your new servicer cannot charge you a late fee or treat the payment as late if you sent it to your previous servicer on time or within the applicable grace period."

I'm unsure if you would be able to combine both loans given that the HELOC is tied to a different property than the one you got traditional financing on.A work around is if you are able to purchase the new property with the HELOC at a significant enough discount, bring the property value up via renovations or additions, then refinance the property, pulling out enough money to repay the HELOC. 

However, i'll likely be looking at additional ways down the road to be even more secure for a backup what if scenario.  

In addition, 100 units would necessitate 100 accounts.  

This would depend on whether your property is overvalued by the tax assessor and in turn you are paying additional taxes on that additional valuation.

HOA is currently $172/month, with and additional $44 for club fees, covering club amenities, including a gym, boat lift, a restaurant etc.