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In large buildings there is most often a chilled water system, and a boiler system and the building management turns the boiler on in cool weather, and the water chiller on in warmer weather, This is always a problem in the spring and fall and when there is unseasonable weather.
That may or may not be the case here.
This is something that is likely beyond what you should be attempting yourself, there could be a bad hot or cold water valve in the air handler, that would be the buildings responsibility.
Tell me what the building management had to say, verbatim about this, that will tell me a lot about the situation and managements capability,
We can go from there without any time limits.