French to English Bus/Financial Real Estate lease handling software

I suppose this really should be 2 questions as it is for a matching pair bail donné / bail pris.

My problem is not in understanding the terms but finding a suitable adjective or other way of expressing this relationship.

e.g.

Le tiers siège peut être indifféremment repris comme preneur ou comme donneur selon que la convention est un bail pris ou un bail donné.

another example

Les baux de sous-locations et le bail pris présentent les mêmes conditions d’indexation.

I've used 'lessor' and 'lessee' to translate 'donneur' and 'preneur'.
I've toyed with the idea of using the verb 'lease ' but I think this may create ambiguities (lease out property -are you the landlord or tenant?) and in any case it is a 'heavy' solution.

Thanks for any ideas you may have.