Model design question: Inheritance? GenericRelation? ...?

Hi,

I have different models A,B,C which all will have exactly on Address.
If I query instances of A,B,C I usually will also need the related
address. I also want to query all instances of A,B,C which have a
certain zip code for example. What's the best and most efficient way
to model that in django?

Using a common base class sound like the most efficient solution, but
feels wrong from a OO point of view. Using a GenericRelation sound
like the cleaner solution to me, but I fear that the resulting
statements might be slow.

Any hint or other solution?

cheers,
Achim

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