2453
From 1911 until its demolition in 1956 the AOI met in the Old Union Engine House at 19th and H Streets , N.W. Over the years the AOI has supported many important civic initiatives including construction of the District Building , the installation of modern city street lighting , and the adoption of Washington 's flag in 1938 .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None