The Oakland A’s are pitching a sweeping offer to the city and Alameda County: The team wants to buy the entire Coliseum site.

That includes the stadium where the A’s have played since 1968, the arena soon to be vacated by the Warriors, the parking lot — everything.

“We think the best way to guarantee our long-term viability and success in Oakland is to own our own home,” A’s President Dave Kaval told us.

The Coliseum is one of two likely sites left in Oakland for the A’s to build a new stadium, the other being Howard Terminal on the waterfront near Jack London Square. Kaval says the A’s offer doesn’t necessarily mean they’re committing to the Coliseum location — but they don’t want another buyer snatching it up, just in case.

Kaval intends to send a letter Monday to Mayor Libby Schaaf, the City Council and Alameda County Board of Supervisors detailing the team’s offer. The A’s are proposing to buy the site in exchange for paying off the city and county’s roughly $135 million in outstanding debt on the stadium and Oracle Arena.

“We think that’s a very robust offer and a sharp contrast to the Raiders, who wanted the land for free” had they committed to building a stadium in Oakland, Kaval said. As it is, the A’s co-tenant at the Coliseum intends to decamp for Las Vegas, possibly after the 2020 season.

Kaval said doubts about transit access and other issues with Howard Terminal mean the A’s have to be prepared to fall back on the Coliseum as a ballpark site if necessary.

“There are no guarantees at Howard Terminal,” Kaval said. “We need an option, and if that means we need to own the Coliseum site, we are willing to do that.”

Many city officials have pointed out that the Coliseum site already has the easy BART and freeway access the team craves, along with a lack of neighborhood opposition.

The team’s offer comes as the city contemplates buying the county’s half-interest in the site and possibly putting the property out to bid.

A number of outfits, including Fortress Investment Group — a money management firm in San Francisco that boasts billions in assets — have approached the city and county about purchasing the land and possibly turning it into something besides a ballpark. The A’s fear they could quickly find themselves shut out.

City Council President Larry Reid, who sits on the city-county Coliseum Authority board, called the A’s offer “a pretty big deal. But other players have expressed interest in the property.”

He added, “The mayor, and I assume a majority of the Board of Supervisors, would like to have some control on what happens to that 130-acre site that the Coliseum sits on.”

Schaaf could not be reached for comment.

Further complicating the A’s offer are negotiations between the Warriors and city and county over terms of the NBA team’s departure from Oracle Arena for San Francisco in the 2019-20 season.

The Coliseum Authority is asking the team to help pay down the remaining Oracle debt, estimated to be more than $40 million, and the two sides are in the midst of arbitration.

All of which should make for interesting conversations when Oakland’s newly hired deputy city administrator, Betsy Lake, sits down for meetings this week with the A’s and county officials to discuss the various proposals.

The A’s offer is the latest twist in the team’s years-long effort to find a new home before its lease expires in five years. Increasingly, there are signs that the Coliseum may be its last option standing in Oakland.

Opposition from Laney College faculty and students doomed the A’s first choice for a ballpark, near Lake Merritt. As for Howard Terminal, besides its transit issues — it’s more than a mile from the nearest BART station and is separated from the freeway by railroad tracks — it’s next door to a scrap metal recycling plant that is distinctly not ballpark-friendly.

Executives of Schnitzer Steel, which owns the plant, sat down with the A’s recently to explain that they operate their pounding machinery at night to avoid disturbing daytime neighbors, said former state Senate President Don Perata, a lobbyist for the company.

That means the A’s could expect the recycling machinery be going full blast right beyond the first-base stands at night games, Perata said.

“I think they walked away with much more informed understanding of difficulty of trying to build that ballpark,” Perata said.