One possible translation of "reseau" is "system" in the sense of piping networks etc., which you would have with a building complex.

I think "systems" is generic enough to cover your case, given the context and the fact that you don't have specifics as to what "reseaux" relates to.

Normally réseau can be translated by network, but this has special meanings, or by system.
All buildings, structures and systems are summarized by ther term infrastructure.

Infrastructure réseau
Ensemble des matériels composant physiquement un réseau.

Au sens général, l'infrastructure, c'est ce qui sous-tend une construction (sens propre ; par exemple les fondations d'un bâtiment) ou une fonction (sens figuré ; par exemple toutes les installations qui rendent possible le transport par le rail dans un pays).
http://www.01net.com/editorial/191722/infrastructure-reseau/

Infrastructure réseau
Terme générique reprenant un ensemble de composants physiques et logiciels assurant la connexion en réseau. L'infrastructure procure les bases de connexion, sécurité, routage, gestion et accès utilisateurs.
http://www.materiel-informatique.be/infrastructure-reseau.ph...

L'infrastructure est un ensemble d'éléments structuraux interconnectés qui fournissent le cadre pour supporter la totalité de la structure.
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Utilisation en aménagement du territoire [modifier]
Le terme est utilisé le plus souvent à propos de l'aménagement du territoire surtout l'urbanisme et les transports, mais englobe en fait tous les aménagements et zonages par les décisions politiques impliquées.

Utilisation en génie civil [modifier]
L'infrastructure est composée essentiellement des fondations d'un ouvrage ainsi que d'éventuels niveaux enterrés. Elle assure néanmoins le transit des efforts venant de la partie aérienne du projet (superstructure) vers les éléments de fondations notamment par le biais de poutres.
http://fr.wikipedia.org/wiki/Infrastructure

Same significance as in English:

Infrastructure can be defined as the basic physical and organizational structures needed for the operation of a society or enterprise [1]. It is the services and facilities necessary for an economy to function. [2] The term typically refers to the technical structures that support a society, such as roads, water supply, sewers, power grids, telecommunications, and so forth. Viewed functionally, infrastructure facilitates the production of goods and services; for example, roads enable the transport of raw materials to a factory, and also for the distribution of finished products to markets.
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According to etymology online [5], the word infrastructure has been used in English since at least 1927 and meant: The installations that form the basis for any operation or system. Other sources, such as the Oxford English Dictionary, trace the word's origins to earlier usage, originally applied in a military sense. The word was imported from French, where it means subgrade, the native material underneath a constructed pavement or railway. The word is a combination of the Latin prefix "infra", meaning "below" and "structure".
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Engineering and construction
Engineers generally limit the use of the term infrastructure to describe fixed assets that are in the form a large network. Recent efforts to devise more generic definitions of infrastructure have typically referred to the network aspects of most of the structures and to the accumulated value of investments in the networks as assets.
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http://en.wikipedia.org/wiki/Infrastructure

Check it out.