Try this link for the correct version of BWEP object library, because yes, the version you referenced is an older version. I'm wondering where you downloaded it from, link-wise.
https://return.mistymoorings.com/bwep/index.phpThe textures used for this building are:
restaurant_5a_building_1.dds
restaurant_5a_building_1_lm.dds
restaurant_5a_building_2.dds
restaurant_5a_building_2_lm.dds
restaurant_5a_railing_alpha.dds
restaurant_5a_railing_alpha_lm.dds
The textures with lm at the end are the corresponding night textures.
Do a system search and make sure that you have the textures, which you probably do. If you indeed do, this problem is usually the result of having a duplicates of them somewhere. If you have the textures and the building show up as black, then a quick way to verify is to make COPIES of the above textures and place them in the texture folder in your sim's root folder. If the building displays correctly, then track down the duplicates and add the word "off" after ".dds." Post back and see if this works. If not, we'll try something else.
Steve