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Solution: Let the height of Daguanlou OP=x,

In Rt△POB, ∫∠obp = 45° 0, ∴ OB = OP = X.

At Rt△POA, oap = 60 0, ∴.

From the meaning of the question, m, that is, solution:.

∴ The height of Daguanlou OP= ≈28 (m).

Attendant: The Daguan Building is about 28 meters high. ..

Let the height of Daguanlou OP=x, that is, OB in Rt△POB and OA in Rt△POA, and then from AB = 12m, the equation can be obtained, and the answer can be obtained by solving it.