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Should I use the indefinite or the definite article before "number" and "house" when talking about them generally as in my sentence and can the article be omitted before "office"?
"All houses have their own numbers. If you don't say a/the number of the/a house or office, other people can get lost or will not reach the place."
number is definite, because it's the specific number of a house.
house is indefinite, because it relates to any house.
The article is optional before office because it is part of a parallel construction, with or as a coordinating conjunction. With parallel consturctions, repeated words can be omitted.
