You are correct! It is best practice for a laboratory technician’s office to be located separate from but located near the preparation laboratory.
We have answered a similar question on this topic: see Lab Tech office space requirements
Configuring the workspaces and floor plans is an important aspect of designing a secondary school science area. We have some information on this topic in our to GUIDELINES for the design and planning of secondary school science facilities in Australian schools In particular see 3.2 Staff office areas on page 16.