construction company ：建設会社 real estate company：不動産会社 住友不動産 is a real estate company, they haven't constructed buildings. They usually have ordered constructions for 三井住友建設 that is a big constructor in Japan. Sumitomo Group is a conglomerate of Big 3 conglomerates in Japan.
Thank you very much! Oh, I didn’t know that 住友不動産 outsources construction! Then I think I would call them a “developer” in English. A real estate company is a 不動産屋 I think. Is there a word in Japanese for “developer”? (who buys a piece of land, designs a building, hires someone to construct it and then sells it) @Peteron
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