Remote Towers are very much dedicated ATS facilities with all the commensurate resilience, security and cyber requirements.
Yes, they can be ‘hosted’ physically within an office building, but it requires considerable assurance, design and engineering work to ensure that they are suitable as operational ATS units.
Physically ‘moving’ a remote tower facility, even if a contingency, and modular and identical in equipment fit, from one location to another is no mean task and is not cheap to effect.