LONDON, July 31 (Reuters) - A consortium led by Israel's Delek Real Estate (DLKR.TA: Quote, Profile , Research) said on Tuesday it agreed to buy properties worth 3.4 billion Swiss francs ($2.8 billion) from Switzerland's Jelmoli Holding AG (JEL.S: Quote, Profile , Research)(JELN.S: Quote, Profile , Research). Delek has bought 88 prime Swiss properties in partnership with its London-listed subsidiary Delek Global Real Estate (DGRE.L: Quote, Profile , Research) and Igal Ahouvi's Blenheim Properties.