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   | BGB 247*). 1 The basic rate of interest is 3.62%.** ) It changes on 1 January and 1 July each year by the percentage points by which the reference rate has risen or fallen since the last change in the basic rate of interest . The reference rate is the rate of interest for the most recent main refinancing operation of the European Central Bank before the first calendar day of the relevant six-month period .   | 
 | Title 3 Loan contract ; financing assistance and contracts for delivery by instalments between an entrepreneur and a consumer* ) * ) Official note : This title serves to implement Directive 87/102/EEC of the Council for approximation of the laws , regulations and administrative provisions of the Member States concerning consumer credit ( OJ L 42 , p . 48 ) most recently amended by Directive 98/7/EC of the European Parliament and of the Council of 16 February 1998 to amend Directive 87/102/EEC for approximation of the laws , regulations and administrative provisions of the Member States concerning consumer credit ( OJ L 101 , p . 17 ) .   | 
 | BGB 551. 1 If the lessee must give the lessor a security deposit for the performance of his duties , then this security deposit , subject to subsection ( 3 ) sentence 4 , may amount at most to three times the rent for one month , exclusive of the operating costs shown as a lump sum or as an advance payment .   | 
 | BGB 558. 1 The lessor may demand approval of an increase in rent up to the reference rent customary in the locality if , at the time when the increase is to occur , the rent has remained unchanged for fifteen months . The demand for a rent increase may be made at the earliest one year after the most recent rent increase . Increases under sections 559 to 560 are not taken into account .   | 
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