sentences:  The central portion of the present house, known as Rossdhu Mansion, was completed in 1773.The grand Georgian manor house was constructed by Sir James Colquhoun and was likely designed by well-known architect John Baxter to replace the 15th-century castle, though no documentation survives.This was the family seat when Sir James Colquhoun, 3rd Baronet led the clan and the writer Janet Colquhoun was his wife.