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For Block 522 Serangoon North Avenue 4, which is located in the Serangoon area of District 19, here are some key points:

- This is a 99-year leasehold HDB property.
- The block is part of the Serangoon North Estate.
- It typically consists of 4-room flats.

To get the most recent transaction prices or rental information, you can visit EdgeProp Singapore and search for "522 Serangoon North Avenue 4" to view the latest listings, transaction history, and pricing details.

If you are looking for a specific valuation or more detailed information on a particular unit, such as a 3-room or 4-room flat, you can also use EdgeProp Singapore's tools to find comparable transactions and market trends in the area.