Since we've had w2 jobs most of our taxes have been paid in payroll already the last few years, so we're just keeping a close eye on it and might reassess and do the quarterly payments in the future if we need to. 

You're missing payroll.

What is their sophistication level with investments, business and real estate?

@Andrew Johnson I absolutely agree in cases where you are the person being represented, because you are clearly a very sophisticated investor and likely did your homework ahead of time. 

(assume you could use it for anything, including marketing/advertising, outsourcing, operations, payroll, acquisitions, rehab, etc.)Please be as detailed as you'd like.We may publish these answers in a report/article/book, so please only comment if you are okay with us sharing your name (and possibly your BP profile picture) in the article.Thanks!

It is super sophisticated, okay thats a lie.If I would live in the building or on the block it is worth more attention.

@Brian Eastman yes, I understand that the loan from the 401k has to be repaid, which we will repay through payroll deduction.

There are other more sophisticated formulas to use, but the $150+ per door has worked for me as a general rule.

Thanks Rick for the info I did run into the loop holes you were speaking of i had came across a rental property through a chapter11 bankruptcy attorney but it wasn't enough equity to do the deal ,Not to mention out of a 156 unit property 51 were vacant the owner had missed payroll 2 months straight, The owner was motivated to sell but not at the price i was looking for.

They are owned by sophisticated investors or syndication entities.