The preeminent deal in the past two years — the $516 million purchase of the Southeast Financial Center in downtown Miami — speaks of the enduring demand by foreign buyers for South Florida office space.

Moreover, it speaks to the health of the region's office market.

Alex Zylberglait.

It's strong thanks to high demand and limited supply, which in turn push up rental rates, said Alex Zylberglait, senior managing director of investments for Marcus & Millichap in Miami.