By Robbie Whelan 

Simon Property Group Inc., the largest mall owner in the U.S., launched a $16 billion unsolicited bid for one of its biggest rivals, Macerich Co., as it seeks to gain scale amid an oversupply of retail space and changing habits of U.S. shoppers.

The retail landscape in the U.S. has been dividing into two distinct sectors, with upscale malls prospering and down-in-the-heels malls struggling to survive. A raft of deals in recent years has left the highest-quality malls concentrated in the hands of a few owners, typically real-estate investment trusts like Simon and Macerich, the third-largest mall owner in the U.S.

Simon is offering $91 a share in cash and stock for Macerich in a takeover move that would give the combined company more clout in negotiating leases with store owners, and give Simon a bigger presence in Arizona and Southern California, where Macerich has a large concentration of properties.

Macerich owns 59 shopping centers, including the Biltmore Fashion Park in Phoenix and Tysons Corner Center outside of Washington, two of the types of highly profitable centers that Simon covets. Simon owns 190 properties, including Roosevelt Field mall on Long Island and Houston Galleria, two of the highest-selling malls in the country.

So far, Simon has gotten a chilly reception from Macerich, according to people familiar with the matter. On Monday Macerich said it had received Simon's proposal and would review it with its advisers.

After decades of aggressive building, mall construction has petered out. Developers built an average of 193 malls per decade from the 1960s through the first decade of the 2000s, according to real-estate data firm CoStar Group Inc. Since the beginning of 2010, just nine malls have been built, and only two are currently under construction.

"We're oversaturated," said Daniel Busch, an analyst with Green Street Advisors, a Newport Beach, Calif., research firm. "Development is off the table. More malls are going to close than open in the mall space over the next 10 years, for sure."

For the surviving malls, however, consolidation has been a boon, even as e-commerce erodes overall mall traffic. Base rents at regional malls increased by 17.4% in 2014, according to the International Council of Shopping Centers, a trade group. That helped mall REITs produce a total return of 32.6%, including dividends, last year, according to the National Association of Real Estate Investment Trusts, their best year since 2009.

Green Street expects about 15% of the nation's roughly 1,100 shopping centers to close or be repurposed over the next two decades.

Simon has reduced its exposure to less-tony malls. Early last year, Simon spun off a portfolio of strip centers and smaller malls into a new company called Washington Prime Group Inc. In September, Washington Prime paid $4.3 billion in cash and stock, including the assumption of debt, for Glimcher Realty Trust Inc., another mall REIT.

The Macerich offer is Simon's largest and boldest takeover campaign yet. The total price tag, including the assumption of debt, is $22.4 billion. Simon said it would sell certain Macerich malls to General Growth Properties Inc., the nation's second-largest mall owner, in what market-watchers see as a way of allaying antitrust concerns.

Simon's offer price represents a 30% premium over Macerich's share price on Nov. 18, the day before Simon disclosed it had taken a 3.6% stake in the company, which investors interpreted as the first step in a takeover effort. Simon had disclosed its 3.6% stake right after Macerich had used its stock to buy out joint ventures it owned with the Ontario Teachers' Pension Plan, making the Canadian retirement fund its second-largest shareholder with nearly 11% of its shares.

On Monday, Macerich shares rose 7% to $92.76, past the offer price, signaling that Wall Street expects a higher bid.

In a letter to Macerich's CEO and chairman Arthur Coppola on Monday David Simon, the chairman and chief executive of Simon Property, said he was disappointed the Santa Monica, Calif., company hadn't responded to earlier overtures.

"This transaction has strong strategic logic and would bring substantial value to our respective shareholders," Mr. Simon wrote.

On Dec. 9, Mr. Coppola attended a dinner with investors and analysts at the Four Seasons restaurant in Manhattan. Also present was Richard Sokolov, Simon's president and chief operating officer. People who were at the dinner described the atmosphere between the two men as awkward.

Mr. Simon has a history of pursuing deals aggressively. In 2007, his company teamed up with hedge fund Farallon Capital Management LLC to buy Mills Corp., another mall REIT, for $7.9 billion, including the assumption of debt. In 2012, Mr. Simon expanded to Europe, taking a hefty stake in French retail landlord Klepierre SA. Last year, Klepierre bought Dutch rival Corio NV for $9.7 billion.

In the U.S., however, some of Mr. Simon's biggest campaigns have been thwarted. A decade ago, Simon made a $1.68 billion hostile bid for rival Taubman Centers Inc., and starting in 2009 Simon made at least four buyout bids for General Growth. Simon ultimately dropped both bids after they were complicated by legal issues.

If Macerich rejects the bid, Simon could choose to mount a proxy battle to install representatives on the Macerich board and ratchet up public pressure. REITs are difficult hostile-takeover targets, however, thanks in part to state laws that protect them from unsolicited bids.

In Maryland, where Macerich is incorporated, REITs can stagger their boards in the middle of a fight without shareholder approval. Doing so would mean only a minority of Macerich's 12 directors would be up for re-election this spring, robbing Simon of the opportunity to gain control in a proxy fight.

Macerich is considering staggering its board, according to a person familiar with the matter. The company has also hired Innisfree M&A Inc., a proxy-solicitation firm known for helping wage and defend against hostile bids, this person said.

Macerich's investment bankers include Deutsche Bank AG, Goldman Sachs Group Inc. and J.P. Morgan Chase & Co. Simon is represented in the proposed transaction by Bank of America Corp.

Liz Hoffman contributed to this article.

Write to Robbie Whelan at robbie.whelan@wsj.com

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