buildings (13.5%) and 360 multi-family buildings (25.0%). There were also 199 buildings in the municipality that were multipurpose buildings (used for both housing and commercial or another purpose). The vacancy rate for the municipality, , was 0.65%. there were 4,636 apartments in the municipality. The most common apartment size was the 3 room apartment of which there were 1,567. There were 606 single room apartments and 503 apartments with five or more rooms. Of these apartments, a total of 2,465 apartments (53.2% of the total) were permanently occupied, while 2,067 apartments (44.6%) were seasonally occupied and 104 apartments (2.2%) were empty. , the construction rate of new housing units was 11.8 new units per 1000 residents. The historical population is given in the following table: Heritage sites of national significance There are eleven Swiss heritage site of national significance in Ascona. There are three churches on the list: the church of S. Maria della Misericordia with the Collegio Papio, the Church of S. Michele with the ruins of a medieval castle, and the Parish Church of SS. Pietro e Paolo. Three houses are on the list: the Serodine House, the Unifamiliare Tuia House, and the Villa at via Ludwig 26. The Balladrum, a prehistoric and medieval settlement, as well as the Albergo, a park with a complex of houses, and the Monte Verità Museum, are also on the list. Two museums, the Museo comunale d’arte and the Museo Epper, and a theater, the Teatro S. Materno, finish out the list. The entire town of Ascona is listed on the Inventory of Swiss Heritage Sites. Politics In the 2007 federal election the most popular party was the FDP which received 32.24% of the vote. The next three most popular parties were the CVP (18.93%), the SVP (15.89%) and the SP (15.29%). In the federal election, a total of 1,419 votes were cast, and the voter turnout was 41.4%. In the Gran Consiglio election, there were a total of 3,346 registered voters in Ascona, of which 1,763 or 52.7% voted. 37 blank ballots and 2 null ballots were cast, leaving 1,724 valid ballots in the election. The most popular party was the PLRT, which received 422 or 24.5% of the vote. The next three most popular parties were; the PPD+GenGiova (with 323 or 18.7%), the SSI (with 307 or 17.8%) and the PS (with 215 or 12.5%). In the Consiglio di Stato