Earlier quoted context omitted.
Maybe he just likes building things that others find useful. When I was younger I rented furniture from a company called CORT. I happened to notice on the contract or receipt or something, that it was a Berkshire company (I didn't know that before then). If I were Warren Buffet, I would have been happy to know that someone was a satisfied customer of one of his companies. I got some decent furniture for a few months…
What has he built
He took Berkshire Hathaway, a struggling textile company, and transformed it into one of the largest and most successful conglomerates in history.