Actually to me it sounds like we are talking about a lunch room or cafeteria in an office building, or within a factory, and the company who runs it.

for example: we are a great company, we do corporate catering and also run several corporate lunch rooms....

There might be a better English term though.

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Note added at 1 hr 20 mins (2004-04-29 21:13:07 GMT)
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see also:
Im Mitarbeiter-Restaurant oder Ihrem Casino im Bistro-Stil können Sie und Ihre Mitarbeiter in entspannter Atmosphäre auftanken. Essen, Trinken und Gedankenaustausch - in einer attraktiven Umgebung. Sie sparen Zeit und Geld, indem Sie sich auf Ihre eigentliche Aufgabe konzentrieren. Unsere langjährige Erfahrung in der Betriebsgastronomie garantiert Ihnen Komplettservice aus einer Hand.
http://www.lohmeier-deimel.de/betrieb/

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Note added at 1 hr 30 mins (2004-04-29 21:23:14 GMT)
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Here it is, I found the perfect term:

*Corporate Food Services*

Our Corporate Food Service Division provides customized food service management for clients in the administrative and professional work environment who view food service as a benefit to their employees.

http://www.bamco.com/upclose/corporate.asp

These are the people that run the cafeteria/ lunchroom on a daily basis, which is different from occasional corporate catering