17 two family buildings (10.9%) and 3 multi-family buildings (1.9%). There were also 5 buildings in the municipality that were multipurpose buildings (used for both housing and commercial or another purpose). The vacancy rate for the municipality, , was 0.52%. there were 179 apartments in the municipality. The most common apartment size was the 5 room apartment of which there were 75. There were 12 single room apartments and 75 apartments with five or more rooms. Of these apartments, a total of 114 apartments (63.7% of the total) were permanently occupied, while 63 apartments (35.2%) were seasonally occupied and 2 apartments (1.1%) were empty. , the construction rate of new housing units was 3.1 new units per 1000 residents. The historical population is given in the following table: Sights The entire village of Aranno is designated as part of the Inventory of Swiss Heritage Sites. Politics In the 2007 federal election the most popular party was the SP which received 26.32% of the vote. The next three most popular parties were the FDP (23.01%), the CVP (20.32%) and the SVP (10.65%). In the federal election, a total of 106 votes were cast, and the voter turnout was 46.3%. In the Gran Consiglio election, there were a total of 218 registered voters in Aranno, of which 146 or 67.0% voted. 5 blank ballots were cast, leaving 141 valid ballots in the election. The most popular party was the PS which received 32 or 22.7% of the vote. The next three most popular parties were; the PLRT (with 29 or 20.6%), the SSI (with 25 or 17.7%) and the PPD+GenGiova (with 23 or 16.3%). In the Consiglio di Stato election, 1 blank ballot was cast, leaving 145 valid ballots in the election. The most popular party was the PS which received 34 or 23.4% of the vote. The next three most popular parties were; the LEGA (with 32 or 22.1%), the PPD (with 24 or 16.6%) and the SSI (with 23 or 15.9%). Economy , Aranno had an unemployment rate of 1.92%. , there were 13 people employed in the primary economic sector and about 2 businesses involved in this sector. 4 people were employed in the secondary sector and there was 1 business in this sector. 11 people were employed in the tertiary sector, with 4 businesses in this sector. There were 124 residents of the municipality who were employed in