Land Baron

Buy three plots of land - the Hearthfire milestone. There are exactly three buildable plots: Lakeview Manor (Falkreath), Windstad Manor (Hjaalmarch/Morthal) and Heljarchen Hall (the Pale/Dawnstar). Do each hold's favour to unlock the purchase, then buy all three plots (5,000 gold each) from their stewards. Sets up Master Architect.