Lisbon and Porto saw the number of properties registered in the local housing increase by 3,400 and 1,300 respectively in 2016. In a new trend, the largest growth took place outside of the historical neighborhoods, where the supply doubled. Lisbon closed 2016 with 6,800 registrations, twice as many as it had in 2015. Of the 13,000 new registrations nationwide, many were due to legalization of irregular situations that already existed rather than brand-new offerings.