 
<translate> Don amsa wannan tambayar, ya kamata mu san cewa: Ginin farko na gidaje, "The Lawn" an gina shi a Harlow, Essex a 1951; yanzu ya zama Grade II listed building. Saboda haka, amsar ita ce 1951. <eng> To answer this question, we should know that: The first residential tower block, "The Lawn" was constructed in Harlow, Essex in 1951; it is now a Grade II listed building.
So, the answer is 1951. 