When should those living in tall buildings break their fast?

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Check below answers in case you are looking for other related questions:
Fasting lasts until the sun sets and is not as some of the Shi’ah say
What is meant by the setting of the sun that makes it permissible to break the fast?

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Related Answers:
What are the pillars of fasting?
How should the Muslim intend to fast?
It is not permissible for you not to fast because of work
Fasting lasts until the sun sets and is not as some of the Shi’ah say
What is meant by the setting of the sun that makes it permissible to break the fast?

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