Yes, Ellen White wrote on several occasions that Jerusalem and its temple would have stood forever as a sign of God's favor if the people of Israel had remained obedient to Him.
Here are some of those statements:
* "Had her people given heed to Christ's teaching, and received Him as the Saviour, Jerusalem would have “stood forever.”" (
SJ 86.4)
* "If Israel remained faithful and true to God, this glorious building was to stand forever, as a perpetual sign of God's especial favor to his chosen people." (
4aSG 99.2)
* "God promised Solomon, if he would remain faithful, and his people would obey all his commandments, that that glorious temple should stand forever in all its splendor, as an evidence of the prosperity and exalted blessings resting upon Israel for their obedience." (
4aSG 114.3)
* "Had Israel remained true to God, this glorious building would have stood forever, a perpetual sign of God's especial favor to His chosen people." (
PK 46.1)
* In a passage quoting the prophet Jeremiah, she reinforces this promise: "'If ye diligently hearken unto Me,' the Lord declared, and 'hallow the Sabbath day, to do no work therein; then shall there enter into the gates of this city kings and princes sitting upon the throne of David, riding in chariots and on horses, they, and their princes, the men of Judah, and the inhabitants of Jerusalem: and this city shall remain forever.'" (
PK 411.2)