I've had a dumb cane plant in my home for a while now, and I've found that yellowing lower leaves can be a sign of both low light and overwatering, so it's a bit tricky to diagnose. However, if you've just brought the plant into your office, I'd say it's more likely that it's adjusting to the new light conditions. Try moving it to a spot that gets bright, indirect light, but not direct sunlight, which can scorch the leaves. Also, make sure you're not overwatering, as this can cause the roots to rot and lead to yellowing leaves. Check the soil moisture before watering, and avoid getting water on the leaves to prevent fungal diseases. With a bit of experimentation, you should be able to find the right balance and keep your dumb cane plant happy and thriving.