Another tenant in our office building left this plant. So inherited another child, which I am happy to do. Any care advice is welcome as well.
That appears to be a split-leaf philodendron. They like a warm room with bright, filtered sunlight and should be watered as soon as the soil is dry. They are, in their native habitat, a climber, so you may notice aerial roots growing out of the plant near the soil. If you give it something to climb (like a post stuck into the pot), you can train it to climb. Just be careful adding the post, so you minimize damage to the roots. You'd also want to make sure that you moisten the post when you water the plant, so the aerial roots get water as well.
Michelle is close with the family, and most of what she said still applies. But if you want to be exact, it isn't a split-leaf philodendron (Monstera deliciosa), it is a Philodendron bipinnatifidum. More information can be found here
Is it not a Japanese Aralia? A split leaf philodendron doesn't have the same lobulated leaves.