Locals can expect traffic delays and parking restrictions near Sheffield and Waveland in coming weeks.
In a video, Tom Ricketts blamed rooftop owners for delaying the overhaul of Wrigley Field.
Talks between the team and rooftop owners have stalled recently.
From Wrigley Field to a proposed LGBT hotel, Lakeview may soon change after 2013 developments.
A rooftops spokesman called the Cubs' assertion "completely false."
The community process hasn't officially started yet, but that didn't stop neighbors from speaking out.
Mayor Rahm Emanuel noted the fact that the Cubs and the rooftop owners both agree on the patio is key.
If the team can't get a pedestrian bridge spanning Clark Street, it could seek one over Sheffield Avenue.
A traffic study recommended getting rid of peddlers and targeting suburban drivers.
But details on the alderman's non-negotiables, like a patio over Patterson Street, remain unclear.
Protesters said they are pro-Cubs, but demanded more input on plan that will "change our lives."
Neighborhood groups plan to rally outside the field Wednesday to oppose the renovation process.
Lights "will flicker in living rooms and bedrooms throughout the ward," Ald. Tunney said.
The Landmarks Commission OK'd the Cubs' plan to extend the ballpark onto Sheffield and Waveland avenues.
The controversial $500 million renovation plan is expected to go before City Council Thursday.
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