He has two houses in two cities. Can he shorten his prayers when he travels to one of them?
Question

                With regard to the ruling on shortening prayers: if a person has two houses in two different cities within one region, and he lives in both of them at the same time, when he travels to one of them, does he have to shorten his prayers or is it permissible for him to offer them in full?.
Praise be to Allah.
    If the situation is as described, and he has taken both 
    houses as his place of residence, then it is not permissible for him to 
    avail himself of the concession of travelling with regard to shortening 
    prayers and other things when he is staying in either of the two cities, but 
    he may avail himself of the concessions whilst travelling between the two 
    cities, if the distance between the two cities is that which allows 
    shortening of prayers, which is approximately 80 km. 

    And Allaah is the source of strength. May Allaah sent 
    blessings upon our Prophet Muhammad and his family and Companions. End 
    quote 

    Standing Committee For Academic Research and Issuing Fatwas