It’s not illegal to establish an accessory dwelling unit in Boulder, but it’s not easy. The City Council will look to change that in coming months, though it’s unclear how aggressive they’re willing to be, given the necessary expense of what several council members called “political capital” for a policy change that would, among other impacts, promote greater density in neighborhoods. Under the city’s current policy, adopted in 2012, anyone looking to set up such a unit — commonly known as an ADU, or an OAU, in the case of what Boulder calls “owner’s accessory units” — must clear a series of hurdles that can be very restrictive. For one, no more than 10 percent of properties within a 300-foot radius can have an ADU.