Rap outfit Zion I has toured the world for 20 years while proudly representing Oakland, a Silicon Valley city that has long fostered the type of progressive hip-hop that Zumbi creates. The next time Zumbi shouts out Oakland at a concert, however, it may feel slightly off.

The tech money flooding into the San Francisco Bay Area — and pushing housing prices higher seemingly by the day — has forced him out of the city. To drive that point home, the rapper filmed his family moving out of their East Oakland home for a music video to a song with an appropriate title: “Tech $.”

“In art, you take your hard times and make them good times,” Zumbi, whose real name is Stephen Gaines, told MarketWatch. “I wrote this song as a reaction to my experience of all of a sudden being introduced to this gentrification thing in the city I love.”

As prices in San Francisco rise to levels even highly paid tech workers can’t afford, Oakland has become the hottest destination in the Bay Area. It’s not just popular for residences: Uber Technologies Inc., the world’s highest-valued “unicorn,” plans to open a gigantic office in the middle of downtown Oakland.

Families who have long relied on Oakland’s affordable housing are feeling the consequences. Zumbi and his family — a wife and two sons, with a third due in August — were renting a home in East Oakland, in the shadow of the ritzy Oakland Hills, when the owner informed them last year that he planned to sell the house.

Hitting the market for the first time in a couple of years, Zumbi was shocked at the sudden changes in the town, saying that rentals that would have cost less than $3,000 a month two years earlier were going for more than $4,000.

Every open rental he visited “looked like a barbecue,” he said, with dozens of potential renters checking out the property, many of them 20-somethings in groups of three to four looking to share a house.

“We’re both eyeing the same thing, but they have four incomes,” he said. “I have me and my wife.”

That has led to soaring rents. Affordable listings declined by nearly 20% from April 2015 to April 2016, according to Trulia, and average monthly rents for single-family dwellings jumped 30% in 2015 alone.

Zumbi’s family couldn’t beat the odds. They moved to the neighboring town of San Leandro and still had to pay more, their rent increasing by about $500 a month. While their former house was surrounded by redwood trees and bird noises, they now live near a busy street that provides a constant noisy backdrop.

But the musician still says he is lucky.

“I’m not a rich man by any stretch, but I’m also not poor,” he said. “I feel like I’m blessed to be able to do my music and support my family and live a decent life, you know. I can only imagine people that are actually struggling economically dealing with this situation.”

Now that he has secured a home for his family, Zumbi’s thoughts have turned to the culture of Oakland, which has fostered revolutionaries, artists and thinkers for generations. Hip-hop icons MC Hammer and Tupac Shakur emerged from the city, Too $hort got his start hawking self-made tapes on city buses, and the Hieroglyphics crew of Oakland natives were able to launch and maintain an independent rap label long before it was considered viable.

Zumbi worries that changes to Oakland’s diverse population and unique feel will upset the delicate chemistry that has helped nurture the city’s sons and daughters. “I’m reacting to it based on my experience and my emotions of seeing something I love about to change and wither away in a way that I don’t think is necessarily healthy,” he said.

The “Tech $” video was a direct response. As he prepared to leave Oakland, he asked a frequent collaborator to film his family’s move. Zumbi—who split with the other half of Zion I, producer Amp Live, last year but still performs and releases music under the name—had already released “Tech $” as a b-side on a 2015 single, and will include it on a mixtape he plans to release next week, called “Stay Woke.”

Zumbi posted the video to YouTube last week. He was surprised by the initial reaction. Just as he was mostly unaware of the changing nature of Oakland before setting off to find a new home, he did not know that other cities across the country were experiencing the same thing.

“When I put out the video, I had no idea people would feel it so much,” he said. “I get so many comments about this happening in Austin, Texas, Portland, Seattle, New York, L.A. All these people are like, ‘Man, it’s happening in my city too.’”