If I have a picture of Jerusalem on my wall, do I celebrate Shushan Purim because I can see Yerushalayim all the time?
Chabad has a footnote
Purim is also observed on the 15th in all locales that are adjacent to a walled city—such as all the Jerusalem neighborhoods that are outside the walled old city.
Since you would be living outside the current boundaries of Yerushalaim, then you would still be required to observe the 14th of Adar. However, since you are that close, you would be allowed to enter the picture and go to a shul there to hear the megilla and celebrate with the inhabitants of Yerushalaim. It would be like someone living outside the current boundaries of Yerushalaim, but who can travel into the current boundaries to join the celebration.