Hi I sent this question yesterday but got no reply. Hi my original proposal on a project was for $14,900 with an add/alt to paint exterior railings for $2,100. The GC sent me a contract for $24,900 adding into the contract painting of the stairwell steel and exterior hand rails. We painted the steel in the stairwells and the exterior steel hand rails. I finished a project in Medford Massachusetts on 6/01/18. The owners kept asking for additional work. I did the additional work and received CO # 1 on 5/07/18 for $15,300 I did the additional work and received CO # 2 on 8/06/18 for $6,240 On 10/10/18 I received a CO #3 from the GC deducting $10,000, saying that they added the $10,000 to the original contract. We painted the steel that they added to the original contract. Can I still do a mechanic lien even though it’s past 90 days from completion even though they did not send me CO #3 until 10/10/18