Judicial Magistrates can award sentences that are of less than 1 year's imprisonment (or a Rs.5,000 fine, at max) and the District Munsif has similar limits. The first court in Tiruvottiyur was apparently a sub-court that began functioning in 1965. It was only in 1996 that the sub-court was upgraded to its current status.
There was a news item that said a building for the combined DM / JM courts was inaugurated in November 2008. Though these buildings seem much older, I'm sure there are no other courts in Tiruvottiyur!