New single-family homes have become rare in the city, much less single-families in the Alexander Graham Bell school district. The elementary school is the kind parents move to North Center for, a fact Centrum Properties is counting on with the second phase of Bradley Place, 24 detached houses at Addison St and the Chicago River. What will new Bradley Place residents do with the money they’re saving on private schooling? We can’t say for sure, but a chunk of it’s likely to go toward the mortgages on homes priced at $1,259,000. Plans call for houses with five bedrooms, 3.5 baths and more than 4,600 square feet.