How big the sago palm root will be?

The house we're going to buy has a king sago palm standing right next to the outer wall (well, it looks like growing out from the wall; but actually it's leaning against the wall). Its stem is almost 5 feet tall. Leaves are almost the same length. We want to know how big its root system is? We may... show more The house we're going to buy has a king sago palm standing right next to the outer wall (well, it looks like growing out from the wall; but actually it's leaning against the wall).
Its stem is almost 5 feet tall. Leaves are almost the same length.
We want to know how big its root system is? We may consider replanting the tree if its really necessary...but we don't want to kill him. (He is very pretty indeed)
Anyone knows? Thank you in advance!!
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