Manasara 18.9

18.9

saptāṣṭanavabhāgaṃ syāduttamaṃ dvitalaṃ nyaset
saptāṣṭabhaktikaṃ kuryātkṣudraṃ ca tritalaṃ bhavet

With seven, eight, or nine parts, one should lay out the superior two-storeyed [tower]; / one should make it with seven or eight divisions: this is the small three-storeyed [tower].