A field for players with the Miracle baseball league -- which serves young people with mental or physical disabilities -- is now part of the park being proposed for the Alameda Landing development in the city's West End.

Catellus Development Group, the company behind creating housing, stores and offices at the 77-acre site, has already agreed to donate land for the specialized field.

The entire project, however, still hinges on city approval.

The Planning Board is set to consider it this week.

The baseball field would be located on a portion of a 9-acre park and would feature a diamond smaller than the one used in traditional baseball.

It would be made of rubber so that people who use wheelchairs or crutches can play.

The decision to include the baseball field in the proposal to redevelop the former Fleet Industrial Service Center followed a meeting between local community activist Roberta Rockwell and others and Dan Marcus of Catellus.

"They really captured my heart and I wanted to help them any way I could," said Marcus, a senior vice president with Catellus.

While Catellus is donating the land, backers of the field still must raise the money to build it.

Rockwell, who got the idea for the field when she heard an NPR segment about the Miracle baseball league, said last month that she expects it will cost about $700,000.

She hopes to secure corporate and other donations.

Athletes with mental or physical disabilities who are between 3 and 19 years old play in the Miracle league, which was established in Georgia in 1998. It has about 143 chapters nationwide.

About 300 children in Alameda would be eligible to take part, according to Rockwell.

Along with the baseball field, the proposed park will feature bike and walking paths, Marcus said.

The Alameda Landing project calls for up to 300 housing units, about 300,000 square feet of retail space and 400,000 square feet of office space.

If the Planning Board approves the redevelopment proposal, the project will then go before the City Council for final approval.