The 「Apartment number (code)」 of your building is written on the details of the building in your rental contract documents.

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※The description may vary depending on the contract type, but in Japanese it is usually described as 「ＡＰ番号」「ＡＰＮＯ」「アパートＮＯ」.

If you signed a digital contract instead and don't have the contract papers, you can access the Tenant's exclusive Website 「＆Leo」 and select the option (check/change the information registered)【ご入居者様情報確認／変更】 (only available for rental contracts under the tenant's name).

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It is also shown on the details of the building that is shown on the information board.