How large would an artificial object need to be for us to detect it near Proxima Centauri

4+ light years away, aliens living on Proxima Centauri B have space travel and incredible technology, but are not interested in traveling out of their system or in returning our radio-babble, rather going about their business.

They have built in their solar system a very large structure as a cultural monument.

With today's technology, would this necessarily have to be the size of a planet for us to 'notice' a new structure, or could it be smaller? How large does an artificial structure need to be for us to detect it "” and could there be a known material/mineral/etc. to enhance a smaller object?

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How large would an artificial object need to be for us to detect it near Proxima Centauri

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