It sounds decent, but there are several lenders in the Denver area that do non-warrantable, so you might want to shop a bit more (Compass bank, Elevations CU, Vectra?).

When I was applying for the building permit I had to get an elevation certificate and the house is 0.74 feet below the BFE. 

I learned who are the good people and who are not.No elevators to get to the top, you must take the stairs.Oh!

If it's in a flood zone that requires insurance, the lender will require you to get your elevation shot.  

I do recommend buying from the individuals who manage your home as it creates a connection to the property that I believe is at an elevated level then simply buying from someone who outsources their management.

Are they thinking about an elevator and heated driveway?

There is some kind of transformation needed to elevate the level of professionalism so this kind of error doesn’t happen in the first place (or is not possible).

This is very common in HOA’s and depending on building (ie if it has elevators, parking garage etc) those costs are not ridiculous

If you don't have a good escape clause, you'll ride the elevator up and ride the elevator down.

For example depending on height you may need to add elevators in the building and that alone would require a large amount of structural modifications.