The way the job was described to me was "sit in a model home all day, offer presentations to anyone who walks in, and upsell as many upgrades as possible."

Highlight/talk up the changes up front put anything upgraded in the ad, repeat it in the phonecall.  

I bought the house as is and it needed upgrades.

My repair/Capex is 1/2 to 1/3 what calculators tell you to use and this includes me replacing roofs/boilers ect and my properties are all over 100 years old but I fix everything and upgrade when I buy so again I use real financials to calculate my profit formula. 

Also if the boiler has not been upgraded in 35 years, there are probably other things that need to be done (e.g. windows, sewer connection, drain stacks, etc.).Lets say you are spot on with your estimate including everything; The bottom line is that you will be all in for ~$700,000 ($600,000 purchase & $100,000 remodeling) and expect to have a Potential Gross Income of $108,000 per year ($1,000 x 9 x 12). 

Showers are all cast iron tubs so I'll re-tile the shower surround, then professionally spray the cast iron tubs.The whole building has been re-roofed with a TPO roof and all windows have been upgraded to dual pane vinyl windows. 

Another thing we do is not take on ugly, broken, or infested units.

If it's a good deal on paper by the time you fix panel and upgrade the kitchen, buy it.

Could you possibly post the link that's not broken?

But if you're trying to sell in a buyers market or you're simply trying to be proactive and looking for a competitive advantage over the other listings in the immediate area, I'd be willing to bet that your money would be better spent in upgrading what's already there.