Accidently Bathroom sink overflow. Will it be covered by my Condo Inusrance

If your sink overflowed and damaged the downstairs condo unit, your insurance will pay for the damages to that unit, if you were considered negligent. The unit owner downstairs is apparently going through their insurance company. That company will cover their damages and will then probably subrogate against your insurance company. You should report the incident to your insurance company so they will be prepared.This being your second claim on your policy, your insurance rates can go up. It should not be adverse to your insurance policy, such as a threat of non-renewal, since the previous claim was not really negligence on your part, but a malfunction. However, you may want to talk to your insurance agent and confirm this will not be a problem with your insurance company. If they think it might be, you may want to see how much the damage is to the downstairs unit and possibly pay for it yourself.