March 2015 rental data - Tokyo Kantei
According to Tokyo Kantei, the average monthly rent of a condominium in greater Tokyo was 2,613 Yen/sqm in March, down 0.5% from the previous month but up 0.5% from last year. The average apartment size was 59.77 sqm and the average building age was 18.8 years.
In the Tokyo metropolitan area, the average rent was 3,106 Yen/sqm, up 1.2% from the previous month and up 0.9% from last year. The average apartment size was 57.17 sqm and the average building age was 17.4 years.