Question 9 - What year was the building constructed?
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The year refers to the period corresponding to:
A building that has undergone a complete transformation refers to a remodel (preserving the front or not). That is, remodeling after a total or partial demolition of the existing building, that results in upkeep of the building's exterior, the height and a number of floors.
To tell the year that the building was constructed, you should find out from the owner, the doorman, or one of the residents about the year of construction or an approximate age.
In case of doubt, decide which seems the most appropriate, depending on the structure of the building or comparison with other neighboring buildings of similar characteristics.