Because the palaces shall be forsaken; the multitude of the city shall be left; the forts and towers shall be for dens for ever, a joy of wild asses, a pasture of flocks;
Because the palaces - most applicable to Jerusalem (note, Isaiah 32:13).
The multitude of the city shall be left - the noisy din of the city i:e., the city with its noisy multitude shall lie forsaken (Maurer). 'The multitude shall be left without a head, and shall not have king or princes' ('Poli Synopsis') It present state (Hosea 3:4-5).
The forts, х `opel (H6077)] - rather, Ophel (i:e., The mound), the term applied specially to the declivity on the east of Zion, surrounded with its own wall (2 Chronicles 27:3; 2 Chronicles 33:14; 2 Kings 5:24), and furnished with "towers" (or watch-towers); perhaps referred here in the next words.
And towers - (Nehemiah 3:26-27.)
Shall be for dens for ever - limited by the "Until." etc., next verse; i:e., without end the present order of things, until the new order of things begins with the outpouring of the Spirit: for a long time.