KlevSandCastle
-1390 70 5652
R56

The lowest point inside the castle is X:60. I'm not sure if your move goes down to bedrock so I thought I'd mention it should go at minimum down to 60.

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SandmineVillage
-1963 70 -1522
R55

A few of the houses have basements. The lowest level to include them is X: 61