2.2 new units per 1000 residents. there were 2,516 apartments in the municipality. The most common apartment size was the 4 room apartment of which there were 736. There were 111 single room apartments and 355 apartments with six or more rooms. the average price to rent an average apartment in Bischofszell was 908.22 Swiss francs (CHF) per month (US$730, £410, €580 approx. exchange rate from 2000). The average rate for a one-room apartment was 494.53 CHF (US$400, £220, €320), a two-room apartment was about 654.29 CHF (US$520, £290, €420), a three-room apartment was about 797.11 CHF (US$640, £360, €510) and a six or more room apartment cost an average of 1393.10 CHF (US$1110, £630, €890). The average apartment price in Bischofszell was 81.4% of the national average of 1116 CHF. The historical population is given in the following table: Heritage sites of national significance There are seven sites that are listed as Swiss heritage site of national significance. Two houses, the Daller House, the double house Rebstock / Rosenstock are included on the list, as is the former paper factory with paper machines. The house and the map collection of the Dr. Albert Knoepfli collection in the Museum Bischofszell, the Catholic Church of St Pelagius with St. Michaels Chapel, the Rathaus (Town council house) and Alte Thurbrücke make up the rest of the list. The entire city of Bischofszell is part of the Inventory of Swiss Heritage Sites. The Rathaus was built in 1747-50 by Gaspare Bagnato and is on Reichenau Island. The catholic parish church of St. Pelagius dates from the 9th Century. Culture and Sightseeing The old part of Bischofszell contains many historical buildings such as the eponymous former bishop's residence. During the annual "Rosen- und Kulturwoche" (roses and culture week) at the end of June a large part of this town section is decorated over 40 arrangements of roses and hosts cultural events such as concerts or balls. During Easter numerous wells in Bischofszell are decorated with Easter motives. The annual rafting race in May also crosses through Bischofszell. The large weir is an interesting spot in the race and the bridge directly above makes a popular place to watch the rafts. Other notable sight include: The "Thurbrücke" - one of the most notable bridges from the late middle-ages in Switzerland. The "Bogenturm" - the eastern gate and guardtower of the old Bischofszell. The reformed church