With limited supply, urban in-fill generational triple net assets leased to top-tier credit tenants in hot markets such as Los Altos continue to be in high demand and many sales are off-market.

Leasing 5.3 million square feet, WeWork has surpassed JPMorgan Chase in office square footage.

Upgrades and redesigns don't come cheap, and owners of older office buildings need to be nimble, flexible and creative to level to playing field.

The single user trend is likely to continue as McClellan Park breaks ground on McClellan Distribution Center to fill a void in the market for high clear-height buildings that can service e-commerce tenants.