A Contract Regarding The Works Defined In The Technical Energy Rehabilitation Project Of The Building Located On Tessalia 4 In Barcelona, ​​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 Generationum (Hereinafter, Prit) Established By Decree Law 36/2020, Of December 30, Which Is Approved By The Modernization Of The For The Execution Of The Prit And By The 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 The Covid-19, And Regulated According To The Regulation (Eu) 2021/241 Of The European Parliament And Of The Council Of February 12, 2021, Which Establishes The Recovery And Resilience Mechanism.