Is there any Class G airspace south of Portage Bay in Seattle?
It appears that Seattle Pacific University is located 14NM north of the SEA VOR on the 350° radial.  This puts the university under class B airspace.

Over the university, class G airspace starts at the surface and extends upwards to 700 FT AGL, class E airspace extends from 700 FT AGL up to 3,000 FT MSL and class B airspace extends from 3,000 FT MSL to 10,000 FT MSL.

From a regulatory standpoint the FAA has a set of guidelines that are found in 14 CFR Part 107.  

There are rules stating you cannot fly an UAS over persons who aren't part of the flight or with the traffic area of airports.  You also cannot operate in areas where class B, C, D or E extends to the ground but that appears not to be the case here.