The ability to modify stuff structurally (which isn’t really structurally but rather just the non-load bearing walls) is pretty standard in commercial leasing. Your employer isn’t getting anything special.
It's more the duration of the lease. If you'd rent a house on a fixed contract for 10 years, landlords would also allow changes under the condition that they're reversed at the end.
Interestingly that's exactly the case in Germany. Home ownership there is one of the lowest in the world so that tenants stay in one place for longer. It's normal for tenants to change apartments as they like during the tenancy. Landlords don't care as long as it's in a good state at the end of the tenancy.
This is absolutely not the case in my buildings for our SMB that is in the single digit millions in revenue. We can make changes to non-load bearing structures and we are not on the hook for maintenance or repairs on the building.
Is it a shared building? For the type of building the op was talking about (e.g. single tenant industrial warehouse) it's typically the tenant who handles maintenance.