In-building RF coverage
Analog/digital is not that significant for in-building coverage. For Fire incidents, mobile repeaters help at the scene. For everyday coverage, in-building bi-directional amplification is the answer.
Even with those, there is still the problem of basic physics that cannot be overcome. If there were very localized spots within the buildings that did not have coverage, that may be something the users have to live with.
Ever since I worked in radio back to 1971, any radio system was only specified or guaranteed to work in 95% of the overall coverage area.
In these incidents in Aurora, if they checked only within a couple of square meters of a specific point and found "CC Scan", well that's the way radio waves can cancel within a certain area.
K4XB, Scotty