Srimad Bhagvata Mahapurana: Book 10: Chapter 50: Verses 50-58
Having deliberated thus, the Lord caused a fortress to be built in the (western) sea (by Viwakarma, the architect of the gods) as well as a city (inside the fortress), extending over (an area of) twelve Yojanas (96 miles) and containing all wonderful things-a city in which expert knowledge of architecture (a science attributed to Twasta, the architect of the gods) as well as (unique) masonic skill stood revealed, and which was specially constructed with roads, streets and quadrangles (strictly) conforming to the site (assigned to them in standard works on architecture). It was (duly) provided with gardens consisting of celestial trees and creepers as well as with wonderful groves and was built (according to a definite plan) with attics and gateways of crystal touching the (very) heavens with their domes of gold, barns of silver and brass adorned with gold pitchers, houses of gold with tops of jewels and floors of emerald, temples dedicated to the deities presiding over the foundation of houses and home-steads etc., and wooden sheds on the roofs of houses. The city was crowded with men belonging to the four orders of society and shone forth with palaces belonging to the rulers of the Yadus (Ugrasena and Vasudeva, Balarama and Sri Krsna).
Thus ends the fiftieth discourse entitled 'The Lord ensconces Himself in a fortress", in the latter half of Book Ten of the great and glorious Bhagavata-Purana, otherwise known as the Paramahamsa-Samhita.