Is the Hadith: "I saw towering castles overlooking Paradise, so I asked, 'To whom do these belong, O Gabriel?' He replied, 'To those who suppress their anger and forgive people,'" authentic?

The Hadith mentioned in the question was reported by Al-Suyuti in "Al-Durr Al-Manthur" on the authority of Anas, who narrated that the Prophet, peace and blessings be upon him, said: "On the night of my Isra (Night Journey), I saw palaces leveled with Paradise. So I asked: O Jibreel, to whom do these belong? He replied: To those who suppress their anger and forgive people. And Allah loves the doers of good." It is also found in "Kanz al-Ummal" and "Al-Firdaws bi-Ma'thur al-Khitab," but no judgment has been made regarding its authenticity or weakness.