CREATE TABLE table_204_749 (id DECIMAL, "courthouse" TEXT, "city" TEXT, "street address" TEXT, "jurisdiction" TEXT, "dates of use" TEXT, "named for" DECIMAL)

where was the first court house built ?
SELECT "city" FROM table_204_749 ORDER BY "dates of use" LIMIT 1
SELECT "city" FROM "table_204_749" ORDER BY "dates of use" NULLS FIRST LIMIT 1