I had already thought out that the facility is "lost". Basically, it most of the data was lost in the old crash, and the rest was lost when everyone involved with the project didn't make it out or at least didn't report it.
Basically, there is still some datatrail left for Renraku, but most of it is located within the Arcology... and that's sorta out of order.
Perhaps one day some Renraku or government guy will learn about it, research and find it's location... but until then the PCs have a home.