Have you been hacking my system?
The forthcoming Cities:Born in Stone from Otherworld creations, written by, ahem, me, includes pretty much *exactly* that. Notes on the standard races and classes in the city. Markets and coinage. Rarity of items. LOTS of 'new uses for old skills' in the urban environment. History of cities, from Sumer to the distant future. Formulas for determining how much farmland you need to support that ubercity of 1 million people. Spells. Rules for combat in narrow alleys or on ledges above the crowded streets. "And much, much, more!"
Sorry for the utterly shameless plug, but I see every OTHER reply is also a plug, and this IS the industry forum, so....