Imperial Roppongi Ichigokan is a steel-reinforced concrete building of 11 storeys above three basement levels at 5-16-5 Roppongi in Minato-ku, completed in November 1982, with 105 residences and shops. The building permit was issued in February 1981, under the pre-1981 seismic standard; a seismic diagnosis was carried out in December 2007, and the result is not stated in the records. Management is fully outsourced to Den-en Toshi Life Support, with a caretaker on weekdays and weekend mornings. According to the management report, the repair reserve stood at JPY 168,472,127 as of November 2025, with no borrowing; the reserve contribution rises to JPY 7,900 per month from September 2026 under a general meeting resolution, and a change of the air-conditioning system from central to individual units was resolved in April 2026. There is no car or bicycle parking. Pets are not permitted, and short-term rental is prohibited.

This residence is a corner studio of 39.57 sq m (wall-centre) on the fifth floor, facing southwest, with a 1.50 sq m balcony. The plan provides a single Western-style room of approximately 16.0 jo with a closet, entrance storage, and a separate bathroom, washroom and toilet; the listing material states that it can be changed to a 1LDK at extra cost. An interior renovation is under way and is scheduled for completion on 13 November 2026, covering a new system kitchen with a water purifier, a new 1216-size unit bath with a ventilation-drying unit, a new washstand, laundry tap and pan, a new toilet with an integrated warm-water bidet, light fittings, joinery, switches and outlets, flooring and floor tiles, new wall and ceiling coverings, and house cleaning. The building has an auto-lock. The residence is vacant, with handover by consultation after the renovation.

The listing material notes an Olympic supermarket approximately 350 m away, a Daily Yamazaki approximately 10 m away, the Mohri Garden approximately 750 m away and the Azabu Library approximately 600 m away.