An example of adaptation of an office building to the requirements regarding the EP indicator after the year 2020 Vol. 521 (1) 2016 / środa, 24 października, 2018 (in Polish) Adrian Trząski DOI: 10.15199/33.2016.01.11 Volume 521; Issue 1 Pages 34-38 Accepted for publication: 03.12.2015 r.