Pacific Office Properties Trust Inc., a publicly owned company with a portfolio of office buildings largely concentrated in Honolulu, is in danger of having its stock removed from trading on the American Stock Exchange.

The San Diego-based firm announced today that it received a warning notice from the exchange on Friday after the company failed to meet minimum standards relating to equity and profits.

The notice doesn’t immediately affect trading of Pacific Office shares on the exchange.

Pacific Office said exchange owner NYSE Amex LLC said the company is out of compliance with listing standards because it has total equity below $2 million and a net loss or losses from continuing operations in two of the last three fiscal years.

Total equity for Pacific Office last year was a negative $12.6 million, compared with a positive $51.3 million in 2009. Pacific Office’s net loss was $77.9 million last year, up from a $23.2 net loss the year before.

Pacific Office said it will submit a plan to exchange officials by May 19 setting out how it intends to regain compliance by Oct. 19, 2012.

If the plan is accepted, Pacific Office shares will continue trading on the exchange during the plan period.

The company has previously said it is trying to raise capital by seeking investment partners or buyers for its six Honolulu office buildings that represent the bulk of company assets.

The six buildings on the market are Waterfront Plaza, Davies Pacific Center, Pan Am Building, First Insurance Center, Pacific Business News Building and Clifford Center.

Pacific Office was established in 2008 by local commercial real estate investor Jay Shidler, who contributed buildings he owned through The Shidler Group to form the new