From the Wikipedia, in an edited quote: Yeşil Mosque (Turkish: Yeşil Cami, "Green Mosque"), also known as Mosque of Mehmed I, is a part of the larger complex (a külliye) located on the east side of Bursa, Turkey, the former capital of the Ottoman Turks before they captured Constantinople in 1453. The complex consists of a mosque, türbe, madrasah, kitchen and bath.
It was commissioned by Sultan Mehmed I Çelebi and completed in December 1419 or January 1420. The mosque was built between 1419–1421 by architect vezir Hacı İvaz Pasha. The artists of painted decorations were Ali bin Ilyas and Mehmed el Mecnun. Following the earthquake in 1855, the building underwent an extensive renovation led by architect Léon Parvillée, as Ahmet Vefik Pasha, the Vali (governor) of Bursa, was unable to find a qualified Turkish architect. Parvillée managed to save the mosque but he lacked experience of the Seljukian and early Ottoman architecture. He was also hampered by shortages of money and skilled labour. The original decorations of the vaults and the walls were not restored. But his whitewash was perhaps to be preferred over botched attempts at reproducing old paintwork."

The (English) Wikipedia continues with “The architectural style known as Bursa Style begins with Yeşil Cami”, however, here is an error. The Turkish Wikipedia (or: ‘Vikipedia’) states that the Yeşil Cami was the third mosque built in that style (the main feature being the reverse-T ground plan), after the mosques of Orhan (1339) and Yıldırım Bayezid (1400). Even the Hüdivendigar Mosque of Murat I (1363) has the characteristic reverse-T ground plan, and its ground floor is not fundamentally different from the Orhan, Yıldırım of Yeşil mosques (although it is part of a larger building combining mosque, dervish lodge and medrese/school).

Correspondent: J.M.Criel, Antwerpen.

The mosque is based on a reverse T-plan with a vestibule at the entrance leading to a central hall flanked by eyvans on the east and west and a larger eyvan with mihrab niche on the south. Two small eyvans flank the entryway above which the royal box (hünkar mahfili) is located. There are four rooms with fireplaces to the north and south of side eyvans accessed through the vestibule and the central hall respectively. Stairs on both sides of the vestibule lead to the upper floor where the royal lodge and two adjacent rooms for the royal women are located. Here, a passage opens to the balconies on the northern facade where the minaret steps begin. A portico was designed but never built, because, when the sultan died, work on his private mosque would stop.