Will you have the chance to visit and inspect beforehand? If so, you will be able to assess the light available.
If it were me and all that were required were shots of interior spaces rather than the detail I would take a wide-angled lens (my 10-22mm) and the nifty fifty. I would also take my external flash but be mindful of reflections if there is as much glass visible on the inside as there is on the outside.
HTH