“Building Standards” refer to the finishes a landlord uses in the building. For example, the entry doors can be wood, 8’ or 10’ tall, glass, or wood with a side window of glass. When you walk through the building look up to the ceiling tiles and down at the type of flooring. Look at the doors.
Most buildings have a building standard. Don’t go into an older office building and expect its finishes to be the same as the brand new 30-story building down the street. Be cognizant that the additional rent gets you a better finish. If you like nice finishes, perhaps you shouldn’t be looking at the cheapest space in town.