The 11 remaining nations in the Trans-Pacific Partnership Agreement (TPPA) without the United States edged towards sealing a comprehensive free trade pact after New Zealand agreed to amend laws that are not subject to TPPA, to enable its ban on foreign home purchases.

The pact aims to eliminate tariffs on industrial and farm products across an 11-nation bloc whose trade totalled US$356.3 billion last year.

This week's compromise saves member nations from having to renegotiate the ambitious trade pact to accommodate the New Zealand government's demands for firm measures to rein in housing prices.

It also brings member countries closer to an important victory in support of free trade to be finalised at an Asia-Pacific Economic Cooperation summit next week in Vietnam's central city of Danang.

"The momentum towards (an agreement) at the meeting in Danang has significantly increased," said Japan's chief TPPA negotiator, Kazuyoshi Umemoto.

Negotiators gathered for three days in Urayasu, east of the Japanese capital, to narrow down which terms of the original 12-nation deal to suspend, so as to salvage the pact at the Vietnam summit.

Canada, though, played down the chances of any kind of formal deal next week, citing the need to ensure the provisions in a new TPPA treaty would not cause problems at ongoing talks to update the trilateral North American Free Trade Agreement (Nafta). The Nafta talks are due to wrap up next March.

"We're moving quite expeditiously but it's probably going to take a little longer, so as for a signature (next week) - that's highly optimistic," said an Ottawa source familiar with the government's position.

New Zealand Prime Minister Jacinda Ardern, who was sworn in last week, has announced plans to ban foreign home purchases that should curb speculation without forcing TPPA countries to renegotiate the pact.

Japan hopes the deal, which links 11 countries with a combined GDP of US$12.4 trillion, can show other nations it is able to champion free trade.

It could also help Japan resist US pressure for a two-way trade pact, which is likely to come up when President Donald Trump visits, from Sunday until Tuesday, for a summit with Prime Minister Shinzo Abe.

The TPPA pact was thrown into doubt when Trump pulled the United States out in January to prioritise protecting jobs. New Zealand and Vietnam subsequently pushed to renegotiate it, but countries have been able to narrow their differences in the final stretch.

- Reuters