I spent the time making the website and I pay to keep it running.

Anne, I will speak to your question with respect to borrowing against the 401(k).

If just going this path is more practical it would simplify things significantly, but everything I understand says introducing these new activities and the respective liability could expose our other property to risk if a nuclear claim occurred related to either property if they were part of the same LLC. 

If something he feels does require a response he is always professional and respectful. 

Like his Flipster website, very inaccurate from the reviews I'm reading here.

I have searched high and low on their city website.

These are not typical life insurance policies.If the down payment comes from an existing asset whether it is money from money market, money from savings account, money from CDs, money from heloc, money from selling stocks, money from stock margin, gift from family, money from life insurance it does not achieve a 100% LTV with respect to determining return.  

I would definitely start your search on the NARPM website.

Cost segregation can help boost cash flow, create substantial tax savings, and increase the profitability of the warehouse operation by accelerating depreciation.A cost segregation study is a strategic tax planning tool that separates the assets that have a shorter useful life and can be depreciated over 5, 7 and 15 years from the residential rental property or nonresidential real property that are depreciated over 27.5 and 39 years, respectively.

Respectfully, you're asking a real estate community if it's a good idea to invest in real estate.