Why are you asking for the right to give or remove access to your model? Are you afraid the architect or someone else might go in and do something?
I would say this is not a reasonable request. Hopefully your firm and the architect have teamed up on other projects and have a good relationship. If this is the first time working with the architect, there has to be some level of trust between the two companies.
If anything, you can download the Source file and save on your local network as an backup copy if you truely that worried.
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