Structural forces, including the leveling out of e-commerce, support a healthy retail sector outlook.

Analysts call it a "top performer," and this recent pullback in fundamentals is more of a reversion to historical norms.

Meanwhile national fit out costs have soared to $1,930 psf for Biosafety Level 3 structures.

18.1% of Class B office properties have maturing loans and many tenants may follow the flight to quality A buildings.