you are likely to find Play in/at/on Theater. Theater is a synonym of House. House is related to Department. Department is related to Flat. 
Modest is similar to Moderate. Moderate is the opposite of Extreme. Extreme is a synonym of Last. 
Play --AtLocation--> Theater <--Synonym--> House <--RelatedTo--> Department <--RelatedTo--> Flat 
Modest <--SimilarTo--> Moderate <--Antonym--> Extreme <--Synonym--> Last 