There are pockets of Logan Heights and Grant Hill I could see coming up... east of 25th is still pretty scary. As for city heights, I agree that I don't see this area revitalizing in the next 15-20 years. Gentrification can only push city heights towards lemon grove, city heights folks are already priced out of all the other neighborhoods that surround the area (north park, normal heights, kensington/talmdage, rolando/el cerrito, la mesa) . They're stuck...
I would bet on Multi-family along the path of the new trolley system, specifically bay park area. The city wants to densify zoning along Morena boulevard, and with direct access to down via trolley, and an up and coming food/restaurant scene developing in the area, this could be a strong in next 5 years.
@Sarah D. - So far so good! Taking a little time to develop the reviews we need to increase our occupancy, but overall its been easier than we thought with the right systems in place, and the cashflow is great! Gonna ride this wave until the city tries to take it away...