Chris Hansen, the hedge-fund manager who wants to bring a basketball and hockey arena to Sodo, says he has locked up the remaining property needed for the arena, and the sales should start closing this week.

Most should close within the next three months, the San Francisco investor said late Tuesday.

Hansen also revealed for the first time that he is buying "a considerable piece" of the block just north of the arena site, and is considering ancillary uses there. He wouldn't identify the properties or say more about the plans for them.

Some possible uses could include parking, a team practice facility or a team store.

Hansen also said he could buy still more Sodo property before he's done.

The proposed arena site is between South Massachusetts and South Holgate streets, First Avenue South and the Burlington Northern railroad tracks, and is bisected north-south by Occidental Avenue South. Hansen purchased the property on the east side of Occidental in December.

There are seven parcels, with four owners, on the west side of Occidental. Hansen said all seven were either under sale contract or otherwise under his control when he unveiled his arena plan in February.

He wouldn't say what he has agreed to pay for the properties, which total about 2.3 acres.

But he paid $21.6 million for the 3 acres on the east side of Occidental, or about $163 per square foot.

If the negotiated prices for the seven properties are similar, Hansen could be on the hook for an additional $17 million or so. That would be more than triple the per-square-foot price that three of the parcels fetched when they were sold less than 18 months ago.

While declining to talk numbers, Hansen did say that "we understand we're taking a lot of financial risk, because we don't have a done deal with the city yet."

Hansen and city and county officials are negotiating an agreement to cover cost sharing and other details of the proposed $490 million, 18,000-seat arena for NBA and NHL teams. Hansen wants taxpayers to pitch in $200 million in construction bonds, which he says would be repaid by revenue from the arena.

Once an NBA franchise is obtained, the city would buy the land from Hansen as part of that taxpayer contribution.

The arena-site properties Hansen is buying include the Showbox SoDo theater, several warehouses and a barbecue restaurant.

The proposed arena would require the city to vacate the stretch of Occidental that runs through the site. Hansen declined to discuss the status of that proposal, as did Aaron Pickus, a spokesman for Mayor Mike McGinn.

"Details like that are kind of wrapped up in the overall negotiations," he said.

Hansen said the additional properties he is buying are on the block north of Massachusetts between First and Occidental, across the street from the Safeco Field garage.

He wouldn't say how many of those he has under contract.

Eric Pryne: 206-464-2231 or epryne@seattletimes.com