Office properties are generally either 100% dedicated office and office plus some other use (mixed use)
Office vacancy rates vary widely across regions, often twice as high in suburban markets than urban centres.
Many dedicated office buildings are owned by corporate landlords who own many buildings as a portfolio asset.
Tenants are looking for ratios of offices and open space, lunchrooms, reception areas (although reception areas are less in demand), efficient and effective HVAC, natural light, elevators, coffee shops, fitness facilities and proximity to transit routes and highways.
Office space is usually ranked A, B, C, D based on amenities offered and rents are commensurate with that.
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See my FAQ or my articles on buying, selling and leasing office properties.