 To fund further growth, the government in 1971 issued the largest urban development bond-offering to that date, worth approximately $110 million, with 9% annual interest rate and a 7-year maturity.These bonds were initially traded on Tehran Stock Exchange prior to their repurchase at maturity in 1978-79.The district's city planning grid was modern and geometric with perpendicular wide avenues (north-south, designated by names) and narrower side streets (east-west, designated by numbers), and most residential plots were subdivided into regular lots of 7 meters wide by 30 meters deep (7x30=210 m2), or 14 meters wide by 30 meters deep (14x30=420 m2, essentially double the size of the smaller, more common lots).