Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
गृहाणि गणयेदेवं तेषां प्रस्तारभेदतः ।गुरोरधो लघुः स्थाप्यः पुरस्तादूर्ध्ववन्न्यसेत् ॥ ५८३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 583.
Count the houses this way, by the forms of their table. Under a long mark, put a short one. Ahead of it, copy the row above.
Simple meaning: The sixteen houses are counted with a table of long and short marks, built row by row.
एतेष्वेतानि शस्त्राणि स्वं स्थाप्यानि स्वदिक्ष्वपि ।
Seven of the eight direction points are named, each placed in its own direction.
ध्वांक्षश्चैव भवंत्यष्टौ पूर्वादिपाः क्रमादमी ।
The eight points rule the eight directions in order. Plaksha, fig, mango, neem and vibhitaka trees are to be avoided.
ये कंटका दुग्धवृक्षा वृक्षाश्वत्थकपित्थकाः ।
Thorny trees, milk-sap trees, peepal, wood apple and tamarind are to be avoided.