Dai-2 Ohanajaya Diamond Mansion is a seven-storey reinforced concrete building with a flat roof at 2-15-17 Shiratori in Katsushika-ku, completed in August 1981, with 75 residences. Management is fully outsourced to Facility Partners, with a caretaker on weekdays and on Saturday mornings. The management report classifies the building as built under the old seismic standard and records no seismic diagnosis. According to the same report, the repair reserve stood at JPY 72,550,664 as of September 2025, with no borrowing and no arrears for this residence; the long-term repair plan exists as a draft prepared by the management company rather than one approved by the owners. The works record includes large-scale repair works in 2003 and 2016 and water-supply changes in 2022. Security cameras are installed on the site. Short-term rental is not permitted. Parking is JPY 15,000–18,000 per month, with no vacancy.

This residence is a 1SLDK of 46.00 sq m on the second floor with a 7.10 sq m balcony. The plan provides an LDK of approximately 10.7 jo, a bedroom of approximately 4.0 jo, a service room of approximately 4.5 jo, closets and a hall storage cupboard, and a separate bathroom, powder room and toilet. An interior renovation is under way and is scheduled for completion on 8 January 2027, covering replacement of the kitchen, bathroom, washstand and toilet, wet-area flooring, new flooring, joinery and lighting, a shoe cupboard and new wall coverings throughout with an accent wall covering, followed by house cleaning. The listed equipment includes a system kitchen with a dishwasher and a water purifier, and a bathroom with a drying unit. The residence is vacant, with handover by consultation.

The listing material notes a My Basket open until midnight (Ohanajaya Ekimae) approximately 550 m away, the Promenade Ohanajaya shopping street approximately 600 m away, a Don Quijote (Aoto) approximately 220 m away and Aoto Heiwa Park approximately 700 m away.