Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
कौजन्यमानं वैश्यानां विप्रादीनां यथोत्तरम् ।यथोदितं जलस्राव्यं द्वित्रिभूमिकवेश्मनाम् ॥ ५९८ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 598.
The Kaujanya measure is for Vaishyas. For the Brahmin and the rest, the next one up in order. Make the water run-off as told for houses of two or three floors.
Simple meaning: Kaujanya is for Vaishyas. Houses of two or three floors take the roof slope as told.
उष्ट्रकुंजरशालानां ध्वजायेप्यथ वा गजे ।
For elephant, camel and cattle halls, use the banner or elephant point.
माघफाल्गुनवैशाखज्येष्ठमासेषु शोभनम् ।
Moving in is good in Magha, Phalguna, Vaishakha and Jyeshtha, and middling in Margashirsha and Kartika.
शशीज्यांतेषु वरुणत्वाष्ट्रमित्रस्थिरोडुषु ।
Enter under Mrigashira, Pushya, Revati, Shatabhisha, Chitra, Anuradha or a fixed star, with Jupiter and Venus visible.