A Controller's Residence usually is adjacent to or contains the working location.  Controller is a 24/7/365 job.  Service term is usually just one year, so the Residence is usually staffed and operated by permanent employees. 

For more on the job description of Controller see Companion Controller's Residence at Rialite described in Mahogany Trinrose:

(From Mahogany Trinrose Ch 3)  'The suite itself consisted of a large sitting room appointed in bright green and white with clear yellow draperies around the heavily insulated walls and windows. It was an intensely quiet room with something of the air of a library. All around the large room, doors opened into the small transfer rooms, which were equipped to handle any transfer emergency.'

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