Retrieves all assets (properties) associated with a landlord profile through its management contracts.

Only valid for profiles with landlord nature (physical_landlord or moral_landlord).

There is no direct /landlords/{id}/leasing_contracts endpoint. To find leases for an asset-based
tenancy, list the landlord's assets here and call /assets/{asset_id}/leasing_contracts for each asset.
For a lease carried by an asset group, use /asset_groups/{asset_group_id}/leasing_contracts.