It's not only about living up North for longer Iftar times (well to be fair, it is much longer up north) but this one is a little different.
You could be living in the same building and have different Iftar times, that's right, Iftar, not Suhoor as we all know. Many homes have two Suhorr times, but Iftar? (Okay, so it's just a small difference. But can you imagine breaking it early. Your fast would be invalid:()

Sunday 19 June 2016
JEDDAH: It is Ramadan time and those living in high-rise buildings might be wondering what timings they should follow for ‘imsak’ (beginning of the fast) and ‘iftar’ (breaking of the fast).
Most scholars have expressed similar views on the issue and maintained that there is a difference in the timings, although it is negligible.
To a query raised by the journalist of a local newspaper in this regard, Fahd bin Saad Al-Jahni, professor of higher jurisprudence and teacher in the Grand Mosque, said those living in towers should break their fast after witnessing the sunset, which is clear for them.
“Those living on 80th floor and below can follow the fixed Maghreb times for breaking the fast, residents staying between 80th and 150th floors should have iftar two minutes after Maghreb and those residing on the 150th floor and above should wait for three minutes after the regular Maghreb time,” Al-Jahni said.
According to Ibn Othaimeen, those on mountains, in valleys and on high-rises have different rulings and should follow the sun’s movements for observing the fast.
http://www.arabnews.com/node/941836/saudi-arabia

