Arnav's mansion was a showcase of his own wealth. It was one of a kind, made in a large area. It sprawled wide and the surrounding areas were devoid of homes or other buildings. It was a large, lush field and forest.
The mansion was almost like a palace, tall and wide with a few dozen workers and maids to tend to every need of Arnav's family. This was the result of his own hard work.
His story was similar to Mithun's, but unlike Mithun, he didn't have any entity like Harsha backing him. He built his empire from the ground up. Arnav was naturally gifted in business. His prowess let him control one of the biggest merchant guilds in the Empire.
The recent deal with the Empire proved to be a good bargain for Arnav; the guild tax cut would ensure that he would be the leader for the next term as well. He got the leverage of speaking directly to the emperor. This meant that he was a more valuable asset for the guild than before.