This depends on the terms of the commercial lease. The fact that a tenant has the right to occupy the premises does not necessarily mean that they can allow another business to use or occupy them.

The lease may limit occupancy of the premises to the designated tenant and stipulate that the consent of the landlord is required before any other person or business may carry out activities there.

Sharing premises may occur, in particular, when the tenant wishes to allow their use by a related company, a subsidiary, a business partner, or another company.

Depending on how this occupancy is organized, it could also raise the question of whether it constitutes a sublease, a lease assignment, or simply a sharing of the premises. The classification can have consequences for the rights and obligations of the parties.

The sharing must also be compatible with the permitted use in the lease, the building regulations, insurance policies, as well as applicable laws, regulations, permits and standards.

The lease may also stipulate that the tenant remains fully responsible for the obligations arising from the lease despite the occupation of part of the premises by another company.

It is therefore best to check the lease terms and, where required, obtain the landlord's consent before allowing another business to occupy or use the leased premises .