"My place we sell. Use the money for a down payment on our family home." Since with all the changes to Harry's history, Walburga Black cockroach that she was, would likely outlive them all. It was therefore highly unlikely Sirius would ever inherit Grimmauld Place, even being the uncontested last living heir of the Noble and Most Ancient House of Black. So Emmeline and Sirius would start something new. A family home full of light and love, where no one got blasted off of tapestries or taken off the wards.
"I'm not overly attached to it. It's part of the past, not our future."