Trzaskowski and 14 1000 apartments in Warsaw. What are they about?

Rafał Trzaskowski repeatedly referred to his experiences and successes as the mayor of Warsaw during his presidential campaign. He boasted about 14 1000 apartments - erstwhile they were "built", erstwhile "delivered", and another time "new". The candidate explains his statements as lacking precision. We explain how many municipal apartments were built in Warsaw during the word of office of the KO politician.