You must possess a valid State of Maryland Construction License. All bids will be sent to via email and hard copy to: Patricia Omondi, Community Developer IV, 9201 Basil Court,.Suite 504, Largo, Maryland, 20774. The Proposal Form shall be filled out in ink. Suite 155 Largo, Maryland, 20774. We make it easy to get a contract bid bond. Just click here to get our Maryland Bid Bond Application. This page contains general information for bidding on construction-related contracts with Baltimore County.