Omaynis, Suramond's House: there is a scroll on the shelf called Transaction History. The scroll is completely empty, but it gives training in Mercantile. Also, and probably just my personal opinion, the interior itself feels a little... random in terms of its clutter. There could be more involved with this character than I know, I'll admit, but at first glance, it seems off. The interior seems to have vanilla values for sunlight, much brighter than the other interiors
 

https://en.m.uesp.net/wiki/Tamriel_Rebuilt:Suramond#