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Upmanu Lall, director of Arizona State University’s Water Institute at the Julie Ann Wrigley Global Futures Laboratory, questioned how much the tanks would effectively reduce losses in fires.

“That would depend on the scale of deployment, because if you can’t get a high density of deployment, you’re not going to really reduce the losses very much,” Lall said.

Another challenge, Lall said, would be persuading homeowners to allow large onion-shaped reservoirs in their neighborhoods and in the natural landscape.

The neighborhood has about 90,000 residents, a slightly higher population than Santa Monica or Santa Barbara, said Jessica Lall, head of real estate brokerage CBRE’s downtown office.

Downtown has about 90,000 residents, a slightly higher population than Santa Monica or Santa Barbara, said Jessica Lall, head of real estate brokerage CBRE’s downtown office.