For many people in NYC, the Air BnB model offers a significant opportunity within the framework of your primary residence - for example, if you live in a 1 bedroom apartment right now, possibly get a 2 bedroom and configure it for guests to stay while insuring your privacy.

Building the framework to update ownership and relationships between all court cases, taxes and property data have been solved and made real time for property owners.

I'm still very new to this but I have created a general framework for what I want.

I have some software background and have built web apps / sites on Python Django web framework (which some of the others use).

When I invest out of state I make sure that the core members of my team, my agent, property manager, and contractor, have all been inside and given me their opinion on 1) quality of the location, 2) rehab estimate, 3) estimated rent post rehab, 4) after rehab value of the home so that I have an idea of what I can take out of the house when refinancing under a BRRRR framework.

The amount of materials and cost that goes into creating a sfr such as foundation is sometimes stronger or frame work is laid out better or more intricately to hold and support more of the house other than a Manufactured home?

I assume that the people who trust you agreed to give you money without the legal framework, otherwise your questions would probably be worded differently.The #1 priority right now is not "the right setup" but making sure your friends/family can continue to trust you.

People have abused the relatively flexible partnership allocation of the partnership items in order to shift income or loss from one partner to another in order to save taxes.Thus, IRS has a framework that can reallocate the partnership items based on the “ partner's interest in the partnership” if IRS determines the method of sharing the partnership items lacks the “Substantial Economic effect” (SEE)To meet the SEE, there are strict rules to maintain meaningful capital accounts including Deficit Makeup Requirement for those accounts.With the requirement, the partner must at some point contribute sufficient capital to eliminate the deficit, and, that way, the partner has the burden of the loss that partnership has and the allocation of the partnership will be respected by the IRS because there is SEE.This is a very high-level summary of the rules and is not comprehensive. there are many exceptions as well. 

The details of these issues are best saved for more in-depth conversations rather than these forums, but I hope that helps with some framework.

Smart people will always figure out a way to work within the framework of any law.