Located on the basement 1st floor of Nijubashi Building in Marunouchi, Chiyoda-ku, Tokyo, Tosho Building Clinic of the medical corporation Kosa Association offers excellent accessibility, just a 5-minute walk from Tokyo Station on the Keiyo Line and 3 minutes from Nijubashimae Station. The clinic provides Internal Medicine and Otolaryngology services, with weekday consultations from Monday to Friday. Morning hours are from 9:15 AM to 12:30 PM, and afternoon hours from 1:45 PM to 5:30 PM. On Thursdays, both Internal Medicine and Otolaryngology are available in the morning session, though consultation hours may vary depending on the attending physician's schedule. An online reservation system is available, and appointments are accepted as usual. For initial hay fever treatment and infection control, patients with fever are requested to contact the clinic by phone in advance and wear a mask. The clinic has a parking lot and is barrier-free. Closed on Saturdays, Sundays, and holidays, with extended closures during year-end, New Year's, and summer holidays.