Mitsubishi Jisho Real Estate Services Co., Ltd. (Head office: 1-9-2 Otemachi, Chiyoda-ku, Tokyo; President and CEO: Shuichi Shimizu) has conducted a market trend survey on Tokyo office vacancy rates and average asking rents as of the end of April 2026, and has announced the results. 【Potential Vacancy Rate】 The potential vacancy rate in the five major wards was 2.19%, down 0.10 percentage points from the previous month. The potential vacancy rate in the seven major wards was 2.57%, down 0.05 percentage points from the previous month. 【Average Asking Rent】 The average asking rent in the five major wards was JPY 36,703 per tsubo, up JPY 1,298 per tsubo from the previous month. The average asking rent in the seven major wards was JPY 31,783 per tsubo, up JPY 837 per tsubo from the previous month. 【Trends in Major Areas】 Average asking rent in the Nihonbashi-Honcho, Muromachi, and Honkokucho area rose to JPY 51,599 per tsubo, up JPY 5,933 from the previous month. Vacancies in lower-priced properties continued to be absorbed, increasing the market impact of higher-priced properties. Due to multiple new listings around Kachidoki Station, the potential vacancy rate rose in the Toyosu and Harumi area. Properties in the JPY 10,000-per-tsubo range still exist in this area, making the market gap with major areas experiencing sharp rent increases especially clear. 【Office Floor Area Trends During Relocation】 Amid a market characterized by rising rents and shrinking supply, companies are seeking more flexible responses, and this is also reflected in floor area trends when relocating offices. In a survey conducted by the company at the end of last year, responses indicating office expansion fell below 50% for the first time in about three years, since Q3 2022. Meanwhile, responses indicating office downsizing reached 30% for the first time in about two and a half years, since Q1 2023. The company suggests that this reflects a move toward floor area optimization in line with curre