An Irrevocable Trust, provides asset protection (you would already have this with the LLC), but it cannot be generally altered or terminated in the same way that a Revocable Trust can be altered or terminated.

I have heard that land/house flippers some time look for cash investors as these are generally all-cash deals.

I generally avoid wholesalers because my experience has been that they are unwilling to use a standard purchase agreement that is fair to both the buyer and seller and they do 'shady' stuff.

This is because losses in a Partnership LLC are generally considered passive or non-passive depending on your involvement, and the structure of the LLC can provide more flexibility in how losses are handled."

I currently only have 1 duplex, however I want to set this up right so it will work for any size portfolio.Currently I haveHome folder>multi family/single family/legal documentsInside the multi family I have Name of property-> general property maintenance/first floor/second floor Inside of first floor (the one currently rented)I have, pictures (before and will have after) / lease documents / a spreadsheet with each month, what day rent was paid, if it was late, if late was fee paid?

It depends on the rent amount and the difficulty of renting in your area, but I'd generally suggest something more like 50%-75%. 

I have had several Colorado LLCs (single member LLCS with one single family residential rental per LLC, so very small-time) for a decade, and always file my periodic report so am in good standing with the Colorado Secretary of State, but have only just heard that I need to file a BOI report before the end of the year.

I have a problem with financial advisors as a general rule, because most are sales people trying to earn a commission. 

If you just hire the cheapest or first PMC you speak with and it turns into a bad experience, please don’t assume ALL PMC’s are bad and start trashing PMC’s in general.

While residential development is generally restricted in these areas, there are specific circumstances under which it may be permitted:Special Mixed-Use Districts (MX): In certain M1-2 zones, residential use is allowed when paired with a residential district under the MX designation.