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P.S.
Also I thought about next phrases:
ручка -> pen
(его) ручка -> his pen
(у н)его ручка -> he has pen
у него (есть) ручка -> there is pen of him
I would say that in russian these ideas are...

I think it's easier to understand if you suppose that pattern "у(at/of) subject ..." can mean "subject has ...". It's really how I think about it. It's really derived semantically from idea of...

> Can I do:
> У фирмы где я буду работать офисы в Россию
(in addition to said above) you can omit "has" thing here (translated as "имеет" or "есть" above) ang get:
У фирмы, где я буду работать,...