Why selling a project needs so much information
A prospective buyer wants to see the dwelling before it is built. So you produce visualisations, a brochure, technical sheets per dwelling type and a banner for the site. These documents apply to the whole subdivision, but they have to match what is built for each dwelling.
Then comes the legal side, per dwelling: the cadastral data, the EPC, the deed the notary draws up and all parties sign. Sales, project management and the notary each work with their own part. Whoever does not know which document is still missing for plot 7 only finds out when the deed is scheduled.
With IRP in Lean ERP you record the sale as the steps of a process, with per step the information that belongs to it. Below is an example of such a step plan. You can model your own processes in IRP.