By Brian K. Rapela, MAI Office property sales in the San Francisco market are expected to reach $5.3 billion this year and show no sign of retreating. Investors are viewing the area as a safe haven of sorts, as such gateway cities are looked upon as trustworthy. That’s a good indication that San Francisco has come back very strongly from the recession. And indeed, office rents have increased faster than in any other major U.S. metro market, as a result of several tech company relocations to the city. Institutional investors remain very bullish about the San Francisco real estate market…