But the agency says the changes will make service more reliable.
It could get new timeline, big cost increase.
The 12.3-mile addition to the light rail route will add six stations and connect the line to San Bernardino County.
Construction begins this weekend on the project, which will bring the light rail route all the way to the Pomona Valley.
Expected to get underway in October, the project has a $280 million funding gap that could be closed with money set aside for projects that reduce greenhouse gas emissions.
There are three proposals on the table, including one that would turn the landmarked property into a hotel and community garden.
Construction will begin in October on the project, which will eventually bring the train to Montclair.
Metro staff recommends tunneling beneath Atlantic Boulevard to extend the line from East LA.
Built in 1888 for a Civil War veteran who also served as a state senator for Iowa, the modernized property features six bedrooms, three baths, separate guest quarters, a basketball court, and a swimming pool.
Since January 8, the Gold Line's been running with the help of buses to bridge the gap in service at the Little Tokyo/Arts District Station. But now, for the first time, the line is running between East LA and its brand new terminus in Azusa.