Portfolio Diversification
| Geographical Diversification | Tenant Diversification |
Major Tenant Diversification | Number of Tenants |
Geographical Diversification
(As of March 31, 2013)
Acquisition Price Basis

Tenant Diversification
(As of March 31, 2013)
Leased Space Basis

Major Tenant Diversification
(As of March 31, 2013)
Leased Space Basis

Number of Tenants
| At IPO (As of September 30, 2001) |
23rd Period-end (As of March 31, 2013) |
|
|---|---|---|
| 213 | 1,131 |
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The impacts from various factors including changes in rental office market in particular areas, damage from earthquake, and drop in rental income due to moving out or bankruptcy of tenants, on overall portfolio can be mitigated through various diversification efforts such as diversification of property location, diversification of industry type of tenants, and number of tenants.

