After condo declaration and tax lot assignment

This past Monday June 29th we received the good news that the appraisal turned out to be good. We are buying a new construction apt in Park Slope. We were thinking we would be able to close by mid-July but we were told the condo declaration and tax lot assignment had yet to be done. The seller broker told us it was going to take 30 days or more. We are not sure about the timeline after that is taken care and if this process actually takes 4 weeks or longer. Has anyone gone through this? What steps did you go through after that was done from the purchaser perspective?