I live in southern CA and have had bees twice. I called a beekeeper to remove them both times, but the hives were Africanized. The first time, they had gotten beneath the roof on my second floor above my stairwell. By the time I discovered they were there, they had extensive honeycombs inside the walls. I had to rip part of my roof and siding off to remove the combs--which you MUST do or regret when it starts melting due to no longer having drones wings moving cool air over them. The bees were so aggressive the beekeeper had to kill them. He took some samples to UC Riverside to confirm that they were Africanized. That was an expensive experience overall. The next time, I notice a few bees following a regular pattern and trying to set up a hive in my porch. That time he was able to collect the live bees (which were also Africanized, but not in such a tough place to get to) and move them. He told me that an Africanized hive can be made into a non-Africanized group by replacing the queen bee with a non-A queen. Within a month, it will be non-Africanized as the drones only live a few weeks and their replacements are from the new queen.