municipality, and an average of 2.1 persons per household. there were 904 single family homes (or 42.1% of the total) out of a total of 2,147 inhabited buildings. There were 252 two family buildings (11.7%) and 480 multi-family buildings (22.4%). There were also 511 buildings in the municipality that were multipurpose buildings (used for both housing and commercial or another purpose). The vacancy rate for the municipality, , was 0.63%. there were 8,647 apartments in the municipality. The most common apartment size was the 3 room apartment of which there were 3,068. There were 856 single room apartments and 877 apartments with five or more rooms. Of these apartments, a total of 6,709 apartments (77.6% of the total) were permanently occupied, while 1,695 apartments (19.6%) were seasonally occupied and 243 apartments (2.8%) were empty. , the construction rate of new housing units was 10.5 new units per 1000 residents. the average price to rent an average apartment in Locarno was 1046.19 Swiss francs (CHF) per month (US$840, £470, €670 approx. exchange rate from 2003). The average rate for a one-room apartment was 611.61 CHF (US$490, £280, €390), a two-room apartment was about 816.64 CHF (US$650, £370, €520), a three-room apartment was about 1007.47 CHF (US$810, £450, €640) and a six or more room apartment cost an average of 1896.51 CHF (US$1520, £850, €1210). The average apartment price in Locarno was 93.7% of the national average of 1116 CHF. Historic population The historical population is given in the following table: Heritage sites of national significance There are nine Swiss heritage sites of national significance in Locarno. Three of the sites are churches; the church of S. Francesco and former convent, the church of S. Maria Assunta (new church) and the house of the canons and the church of S. Maria in Selva with Cemetery. The Castello Visconteo complex (part of which may have been designed by Leonardo da Vinci) is on the list. Two schools, the Ai Saleggi primary school and the Secondary School at via Dr. G. Varesi 30, as well as the Cantonal Library, are also listed. The last two are the Pinacoteca comunale Casa Rusca at piazza Sant’Antonio and the Casorella at Via Bartolomeo Rusca 5 make up the rest of the list. The entire city of Locarno is listed on the Inventory of Swiss Heritage Sites. Main sights Locarno has a number of interesting sights that draw