Interviewer instructions
B.3 When was it built?
Here one of the dates offered as an answer is noted. While determining the date of the building (house), the date is chosen when the house (building) was put in use.
For example; if the building of the house began in 1979 and was finished in 1981, then the "1981-1990" prompt is written, the date when the building was completed.
In case of rebuilding the house or adding more floors, the date when it was out in use is considered to be the original building year.