The Sayyid Alam Masjid is located in the Khanpur neighborhood within the historic walled city of Ahmedabad, not far from the Sabarmati. The mosque's namesake is Sayyid 'Alam or 'Alam al-Din Abu Bakr, who is named as a descendant of Hasan ibn 'Ali (Hasani) in the mosque's inscription. That inscription, which is only partly legible, dates the building to circa 1412/815 AH.

The mosque is a rectangular structure opening through several portals onto its eastern side, where it adjoins a large open court with a tank in its southeastern corner and a number of burials. 

The mosque itself has a main central wing flanked by two side wings with lower ceilings. The central wing opens onto the court through three large archways. Flanking the central archway are two ornate minarets in the form of engaged cylindrical pillars. These broaden into cornices supported by brackets at their tops, which are currently aligned with the level of the roof. Flanking the central wing are the two side wings, which have completely open facades supported by three pillars. 

The interior of the central wing of the mosque is divided into three large domed bays aligned with the three archways of the facade. The domes rest on freestanding pillars and engaged columns on the qibla and side walls, and one aisle separates them from the front of the mosque. The side wings consist of one large domed bay supported by pillars and engaged columns, also with one aisle separating them from the facade. Dividing the side wings from the central prayer hall on each side are heavy walls pierced by two windows and one door. Five mihrabs, one under each domed bay, mark the qibla on the western wall. Small domes cover the bays of the front aisle at each arched entrance. 

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