If it goes off an error how can one shut it off. 

I totally understand your frustration maybe by a rookie architect that may not be able to validated the engineering calcs, but in top of that a structural engineering?  

I almost wish I had done a cash-out refi, but property 1 is in a great area with good shot term and long term financial outlook.Maybe it's pride or just being stubborn, but the 4plex will still cash flow very well at the purchase price even with 100% financing (including capex, insurance, taxes, maintenance, PMI, margin of error, etc.)

Save your money and time.Just read his books- multi family millionsIt's all great stuff nothing new but great stuff nonethelessYou can learn everything you need to by listening to real people on the BP podcasts and by simply picking your neighborhood, product and start making offers.Learn as you go and when you make a $1500 error while rehabbing that's much better than $1500 in a classroom.

No room for error.

Most people on here learn from trial and error.

It sounds like you might be thinking about upping the game and you might make some foolish errors. 

It costs you extra to pay for error and omission and transaction insurance.

I don't think there's any harm in asking.Do a search on the address first though to see if it re-appeared under a different MLS #; it's unlikely but remotely possible it was removed due to an error in the listing and re-entered as correct.If you're talking about commercial property, it's also possible that they pulled it from the regular MLS and entered it into the RI Commercial Information Exchange (RICIE).

The point here is that you need to make sure that you have some room for error, and buying at low cap rates really leaves you very little room for error.