The vendor should not be the memory system
Vendors may have their own records, but the owner needs an independent history tied to the building.
When vendors change, the owner should still know what was serviced, when, and what was recommended.
Invoices create continuity
Past invoices show service dates, descriptions, and amounts. They can bridge old and new vendor relationships.
A new vendor can review a cleaner asset history faster than a pile of old emails.
Vendor book and timeline work together
The vendor book shows who did work. The timeline shows what happened to the building.
Both should draw from the same service events.