Options to allocate RE costs within company (lease in)

Hi

what options would you recommend for this purpose?

In our case the company has several lease-in contracts and the costs are first posted to either RE objects or contracts. Different departments are using the rented buildings and we would like to allocate the rental costs to those departments.

Would you recommend to handle this via CO allocations, internal contracts or using the room reservations/Long-Term seating arrangements?

Thanks in advance!