It really depends on the area in North Center. I know you said Bell School District, bu even then there is some disparity in pricing. Roughtimate between $400-$500,000 (and even more), depending on how the land is zoned and whether or not it is a tear-down or ready land.
Bell School District is highly sought after. Sometimes you can do better knocking on run-down houses' doors and asking if they want to sell.