Are their vendor contracts (trash, insurance, etc...) that will change?

Tripledeckers have pretty good income to cost (one roof) etc, and all your potential vendors, lenders etc know them inside and out. 

I am also not speculating we manage over 600 units and facilitate 10+ roofs per year and shop multiple vendors.  

This should be taken as an example of why you cannot normally trust CAP rates provided by third parties - particularly the Vendor's pro forma / memorandum of offering where there will be motivation to provide a rosy picture.CAP rate is only a single metric and like other metrics (GRM, Price per unit, etc), it is insufficient to base a purchase decision upon it.

I am getting quotes from several vendors that can install all possible options.  

@Cindy Ace Bradford White, Whirlpool, and a few other vendors sell 40 - 50 usg lowboy hot water heaters (<32" tall).  

Our motivation is to buy condo's off the popular beaches, where tourist are investing, and lease, and/or rent out the condo to vacationers, or long term visits by corporate vendors.

I would say that basing a purchase / model based on price you may only end up with the cheapest vendor not the best fit for you.

@Dana Holland put everything in writing to the vendor , email will suffice, as well as any requests from the tenant must also be in writing.

Hello Nick, my company brokers for many vendors.