“For this city has aroused My anger and My wrath since the day they built it until this day, to remove it from before My face.” (Yirmiyahu 32:31) Perhaps until this day He is in anger? The scripture says “His Tabernacle was in Shalem, and His dwelling place in Zion,” (Tehillim 76:3) He returned her original name. So too it says “…the mountain that God desired for His dwelling…” (Tehillim 68:17) meaning that it is still cherished and desired.
This teaches that her destruction brought atonement for her sins. From where do we learn that the Presence will not return to her until she becomes a mountain, as it says “And Avraham named that place, The Lord will see, as it is said to this day: On the mountain, the Lord will be seen.” (Bereshit 22:14) And it says “Remember, O Lord, for the sons of Edom, the day of Jerusalem…” (Tehillim 137:7) When? Once her foundations have been uprooted, as it says "Raze it, raze it, down to its foundation!" (ibid.)