Specifically the ways that you can exchange based on percentage or just the LLC selling and then buying. 

I have a lot of other examples also and a high percentage of them end up calling me after the transaction asking about taking legal action (usually too late, the deal is closed, sad fact is they just screwed up). 

and if so, what percentage could we claim as a loss? 

Seems like they are running a Pawn Shop, homeowners in Austin/Miami/Tampa etc who need cash bad sell a "HomeShare", percentage of their equity in their home for a discount, with a term of 10 yrs, if the homes go up in value as they have since 2011/2012 then NADA gets the original equity already at a premium price plus any appreciation for the total percentage they bought from the homeowner, but since Austin now down 20% in last 12 months and other hot home markets may also continue to fall, and NADA does not engage in price discovery (ie shopping for best value) as they want to obtain a "Market Value - ETF like" of the cities they invest in.

What percentage is reasonable to find the deal and walk him through the rehab and refi process?

You could even ask an experienced wholesaler to look it over.I agree, but I think a lower percentage than 5% would know what to do investing and remodeling.

Multi unit changed the math for me in some calculations.One exception to the rule above is syndicating with a PM who also is an LP and receives management fees as a percentage of profits (rather than typical PM fees).

What you do with your money is your business, except the IRS wants its percentage of the profit (well, less any other deductions that apply).Don't forget that investment properties have to take depreciation. 

Your husband should review the plan documents or contact the plan administrator to understand the specific rules that apply to his 401(k) plan.Loan Limits: 401(k) loans are usually subject to certain limits, such as a maximum loan amount based on a percentage of the account balance or a set dollar amount.

and what percentage of the units can be rented out?