Certainly, a building that can communicate with its different components and understand what's working when, and why it needs to be working at that particular time.... This is a really good thing for buildings to have.
That being said, if it's going from zero to a hundred, it might not be worthwhile for every single type of building. The largest culprits are the buildings that have been neglected over time. They're not the prestige buildings. They consume a lot of energy, and no one has really paid attention to them. Those are the ones where the biggest value could be had for even the lowest cost.
I might recommend a selective approach where you're choosing which ones are already high performers. Those ones will definitely see improvements with these BAS systems—these smart building technologies. Then, with the ones that have not had that kind of attention, maybe start off just by doing an audit and starting to put in place some basic retrofits for those buildings.