I can't seem to find anything specific to this in the Building Code (See Chapter 17-3 for further reference on bulk and density standards in business and commercial districts).

From the code book: They’re designed for nonpressure (drain, waste, and vent) applications, and are manufactured in shielded (completely wrapped in stainless steel) and unshielded (stainless band clamps at each end only) versions.

The Code Solution is solid

This list would contain the zip code and corresponding name of the municipality.

I can't seem to find that video now and was wondering if anyone knew what that code was?

Reservation is placed on hold until receivedThis Rental Agreement and Contract (the “Agreement”) is a legally binding agreement made and entered into as of the Reservation Date written below by and between the undersigned person(s) or company (the “Guest”) and the undersigned owner, manager or agent (“Rental Agent”), pursuant to which the Guest has agreed to rent the residence described below (the “Property”), for the duration of the Rental Term for the Total Rental Fee and other good and valuable consideration as described herein.Smoking is NOT allowed inside OR Smoking is allowed outside only.NO TINFOIL IN OVEN IT WILL MELT AND FUSE TO BOTTOM OF OVEN(ask me how I know)Arrival:I will txt or email you the entry code at least a day priorCheck in time is 4PM unless other arrangements have been madeDeparture:Please depart by 11AMLeave beds unmade that have been slept inWash all dirty dishes & utensils, you can leave the dishwasher running when you leaveCheck for personal itemsClean out refrigeratorPlease confirm the door is LOCKED and tightly closed at departure.

I know from a code standpoint.. duplexes vs. triplexes are VERY different.  

There is nothing ethically (Realtor code of ethics) or legally  (at least in my state) wrong with charging for work that you preform.

Typically, we demo all the drywall to take a peek behind to ensure insulation is up to code anyway, but I can understand as this a 70s house, therefore you may be fine. 

UNLESS your willing to pay recapture.. you will always have to roll into the next deal via 1031 ( as long as that stays in the tax code and it made it through the last change ).. other wise if you go to exit recapture is going to take a Very big chunk of what ever you made in cash flow plus your non appreciating asset will cost you money to sell there by taking  a loss.Whereas, if you have the 500k tax free buying GREAT performing notes could be a good option stock market other investments that just throw off cash flow.. 500k in great notes will bring you in 40 to 60k a year with NO tenant or management issues and NO recapture to worry about.. so there are more than just rentals to think about.But if your like many I see on BP whose goal is to buy and hold FOREVER and then hand it all down at stepped up basis to Heirs I like that play as well.. but the reality of life given divorce rates and just plain life is that most never actually do that most have to exit at some point and then that recapture is a beotch.. to me its front and center I sold all my rentals in the last 2 years and it cost me over 6 figures to do that in tax's ( recapture) so I made zero on all that cash flow for all those years having to give it all back.. :)  I also though have significant amount of notes and will continue to add those ..