Do you know if the existing elevator installed in the condo was also installed in 2000? Do you have info on the existing elevator? The reason I ask is the list you provided above is for a full on modernization and the reason there are multiple items listed such as the pit ladder is that when certain items are updated the rest of the elevator will be required to come up to code. Often changing controller is the item the would require the other components to be brought up to code in many jurisdictions. None of the items above would be cosmetic other than the hall and car buttons but as I said earlier they are often required to be changed to meet current code or to work with a new controller.
I am also was curious about the brand and model of elevator as many hydraulic elevators that were installed in 2000 are still very much maintainable. You mentioned the temperature issue in the mechanical room, and if that is not addressed you very well may have the same issues after spending all the money on a modernization.
As far as the cost goes it sounds very reasonable if not rather low for your area. The other thing to keep in mind though is that you may have to bring other items up to code to like your fire alarm system, equipment room or electrical as part of a upgrade like this which could add a lot more cost.
