Mid-Market wasn鈥檛 first on most must-live wish lists a few years back. With the recent renaissance in the area鈥攁s tech giants, such as Twitter, have been feathering their nests in the neighborhood–the commuter-friendly locale is now in high demand. That鈥檚 why it鈥榮 good news that a site at Mission and 10th streets is prepping to…