The Grand Khan, dating back to 1861-2 AD must be considered as one of the key buildings representing old Koya. It provides a typical example of a Khan of that period and is one if not the only last example in the region of northern Iraq.  The building, however partly ruined, is still rich of interesting details, like the lintels and reveals made of
so called “Mosul Marble” and partly decorated with encarvings.
Former repairs and stabilization measures are visible in many parts of the structure.

Before the execution of the safeguarding measures, the building was documented in its current state, using laser scanning and photogrammetry.

As an emergency safeguarding, the endangered structures of the Khan had to be stabilized to halt further collapse. The wall crown of the Khan’s entrance was stabilized by lime masonry. The last remaining vault of the east gallery was in danger of total collapse. Its pillar was pulled together by steel anchors, attached to a steel frame to hinder further shearing. For further stabilization, a steel prop with a concrete base was installed. The teared roofing, laying open the hollow vault, was filled with light mortar stones and covered with compressed loam. The same was done for a tear in the roof of the western arcade. Also in danger of collapse, the arches were filled with gypsum masonry to distribute and decrease the loads from the pillars.