Looks like the Boettcher is planning to avoid the mistakes made in the Ellie Caulkins Opera House renovation:
The city will hire a special consultant to make sure Boettcher is fully compliant with the Americans with Disabilities Act. The Ellie was promptly condemned by many disability groups, and a lawsuit against the city is pending.
Caulkins Opera House lessons will help guide next project
Some background on the Ellie accessibility issues:
Disability Coalition group files suit over arts access
Partial Settlement in Denver Performing Arts Complex lawsuit