A Contract Regarding The Works Defined In The Technical Energy Rehabilitation Project Of The Building Located On Sasser 6 In Barcelona, ​​With Measures Of Sustainable Public Procurement, At The Municipal Institute Of Urbanism Of The Barcelona City Council, With Measures Of Sustainable Public Procurement And Funded With Funds Of The Mechanism Of The Recovery, Transformation And Resilience Plan Of The European Union - Next Generation (From Now On, On The Age Of 30, The 36Th, December, Which Approves Urgent Measures For The Modernization Of The Public Administration And For The Execution Of The Prit And By Regulation (Eu) 2020/2094 Of The Council, Of December 14, 2020, Which Establishes An Instrument Of Recovery Of The European Union To Support The Recovery By The Crisis Of Covid-19, And Regulated According To Regulation (Eu) Of February 2021/241 2021, Which Establishes The Mechanism Of Recovery And Resilience.