An office lease is a unique financial transaction.  While supply data is widely available, the values associated with completed leases are not so readily available, nor is the financial position of the landlord and its partners.  In effect, despite the preponderance of available data in residential markets (e.g., Zillow, etc.), office markets remain opaque.  The educated occupier can certainly access more information today than in decades past. But it’s not enough to merely know available spaces. Achieving a complete understanding of the markets can only be accomplished by partnering with a firm which is engaged in the market in a variety of very specific contexts.  You need an intimate understanding of landlord motivations, capital structures, and even the intricate dynamics of tenants within a building. Yet many real estate service firms don’t have this information because they lack the practice groups.