Not necessarily. I assume you are subleasing or for some other reason the member signed the commercial agreement as a prerequisite to being able to lease. Either way, who needs to sign depends on the operating agreement for the LLC. Generally a manager would sign any documents regarding business of the LLC. It may be a member managed LLC, unless you're operating agreement sets it up otherwise. If it is member managed, both must sign unless, again, your operating agreement specifies something different.
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