Leander's Villa (Location)
You'll pass through here on the Absolute Power quest in the late game.
Both treasures are in the same room, on the second floor of the main house.
Come in via the roof of the shed built into the east wall. A beam here will allow you hop to a statue, then to the central building balcony.
Guards do pass through here with some regularity, so use the top of the stairs as an ambush point.
When you've got a moment to yourself, loot the white chest by the desk, and the red chest by the south door.
This completes the location.