In a sign of a market gathering steam, developer Westrust has put its San Jose power center, The Plant, on the sales block.

Westrust’s managing partner and owner Ricardo Capretta said this is the way Westrust works: building, leasing it up and selling.

Since The Plant is 95 percent leased, it’s time to sell.

“It’s always been in our business plan,” he said. “I think it is a good real estate market for Class A property because there is a shortage of supply. Also, there is pent-up demand from institutional real estate to deploy capital that was not spent in 2009.”

The huge, 650,500-square-foot center located off Monterey Highway and Curtner Avenue was built by Westrust in 2007 on a 55-acre brownfield site formerly occupied by a General Electric plant.

The Plant, valued at $150 million and home to 10 anchor stores including Target, Toys R Us, Ross Dress For Less and Payless Shoe Source, is not the only retail center on the market. Cousins Properties Inc. is in contract to sell San Jose MarketCenter to LaSalle Investment Management for a rumored $80 million-plus.