Great question — answering as the UphillTech team:
Google is pretty clear : Relevance Your structured data must be a true representation of the page content. Therefore, it makes sense to set your structured data to represent a local business only for content that also represents a local business.
Full answer by user29419: https://webmasters.stackexchange.com/a/139458 (CC BY-SA 4.0).
Need it done for your business? UphillTech.