Markandeyapurana 49.54

49.54

yāḥ śākhāḥ kalpavṛkṣāṇāṃ pūrvamāsan dvijottama /
tā eva śākhā gehānāṃ śālātvaṃ tena tāsu tat //

Those people thus made towns and other abodes for themselves to dwell in; they made houses for the several couples to dwell in. As trees were their first kind of houses, so, with a remembrance of all that, those people built their houses. As some branches of a tree go in one direction, and others go in another direction, and some rise upwards and some bend downwards, even so they fashioned the branches in their houses. Those branches, which were the branches of the kalpa trees at first, O brāhman, became rooms in the houses in consequence among those people.