In a one point perspective it can be found using the "DPR" and "DPL"
Those are Diagonal Point Right and Left respectively.
They are fairly arbitrary and the size should be at least the size of the section typically. But too far or too close will distort the drawing. They should be located on the Horizontal Line (HL)
Then you setup what is referred to as the perspective grid.
That is draw lines along a horizontal lower than your HL. And intersect them with your DPR and DPL and you will have your placement for objects.
Refer to Francis D.K. Ching architecture books for further reference.
There is a formula for finding exactly where the DPR and DPL should be for no distortion but I am not familiar with it. Can probably find it online somewhere.
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