Answer: True
Explanation:
From the question, we are informed that Pat promises to install granite countertops in the home at 123 Main Street that Bruce is buying provided that the escrow on the sale of 123 Main Street closes.
The close of escrow on the sale of 123 Main Street is a condition precedent to Pat's promise is true. This is because Pat will only fulfil her promise given that there is a close of escrow on the sale of 123 Main Street.