Citrus identification help

Hopefully some of the citrus aficionados and experts here can help ID a citrus for me. This tree was already here when I recently purchased my home and it was in rough shape. The wall blocking much of the sun from the south wasn’t there when it was there. It is next to a large clementine mandarin tree and two lemon trees.
I noticed some fruits growing and sampled them knowing their are unripe to try to ID it. The fruit was surprisingly sweet given the unripeness. A bit dry with some bitter aftertaste. Can anyone help ID this? Maybe some sort of tangelo?

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