When did Digital Realty Trust go public?

Could you possibly enlighten me on the timeline of Digital Realty Trust's public offering? I'm quite fascinated by the company's journey and would like to know precisely when it made its debut on the public market. Could you perhaps provide me with a specific date or year when this significant milestone occurred? Your expertise in the field of finance would be invaluable in this matter, and I'm eagerly anticipating your response.