The mansion at 105 Brookschase Lane in Windsor on the James is listed for sale at $4.2 million. (Photos courtesy of CVRMLS) Richmond’s high-end home market heated up in recent weeks with the addition of three multimillion-dollar listings along the north side of the river. Priciest and largest among them is 105 Brookschase Lane, a 12,500-square-foot mansion in Henrico’s Windsor on the James neighborhood that hit the market for $4.2 million. A few doors down the street, the 8,400-square-foot house at 125 Brookschase Lane was listed this month at $2.4 million. The home features a multilevel curved staircase. And downriver in Windsor Farms, the 9,300-square-foot house at 332 Clovelley Road…