As one leaves Dongguan's courtyard they are met by this large Arabic installment. Although I remain unsure of its author, we can ascertain its completion date - Nov. 2009 - from DSCN0942. This fits with the founding dates on many of Xining's other mosques, all of which fall roughly between 1999 and 2009. This sign gives one of the earliest dates I have seen on a mosque, leading me to believe that perhaps Dongguan led the way for a revival of Islam in Xining in the past decade.