There were a few locations considered for the Astrodome but they settled on a 494 acre tract of land six miles just south of downtown where the new Loop 610 freeway would eventually pass by. Much of the land was owned by R.E. "Bob" Smith and he, along with Roy Hofheinz, finished purchasing the rest of the land from the Hilton Corporation. Smith and Hofheinz became the primary owners of the team until a falling out in 1965. Hofheinz envisioned monorails to sweep people from various areas of the parking lots up to the front gates of the stadium. The rail system was never done but they did provide tram service. Half of the stadium was built underground to limit the vertical travel by fans on the ramps. That is why the Dome looks smaller than Reliant Stadium today, which sits just to the west. The playing field inside Reliant Stadium is at street level because it would have cost a lot more money to rip up the sewer and piping systems that were under the parking lot surrounding the Astrodome. Fans are required to walk up three ramps to get to the Main Concourse.