Sent a LOI to a client and they have decided to pay 50% of balance immediately and the remaining balance in 4 months. They have sent a letter for us to sign agreeing to these terms under the condition that we withdraw the lien claim against them. If we sign, are we relinquishing our right to collect the remaining balance if not paid by the 4 month? Will we have to send a new LOI with the new remaining balance, or would we go forward with a Mechanics Lien?