The price of parking is a strong influence on mode choice. Most employers subsidize parking for employees. However, the Bureau of Labor Statistics reports that only 7% of the civilian workforce has access to subsidized commuting (excluding parking). See https://www.bls.gov/ncs/ebs/benefits/2016/ownership/civilian/table40a.htm
More cities could require employers that provide parking subsidies to employees to also offer a commuter benefits program that supports and encourages their employees to bike, ride transit and vanpool to work. Section 132f Qualified Transportation Fringe Benefits of the Internal Revenue Code allows most employers to provide up to $255 per month to employees tax free for parking, transit, and commuter highway vehicles (e.g., vanpools). Employers do not have to subsidize; they can offer employees a pre-tax option of buying their own bus passes and vanpool fares up to $255 per month. Employers also can reimburse employees who commute by bicycle regularly up to $20 per month.
Providing employees with a choice (instead of just a parking subsidy) will encourage more use of commuting by bike, transit and vanpool.
See examples in San Francisco Commuter Benefits Ordinance: https://sfenvironment.org/commuter-benefits-ordinance-sf. NYC’s Commuter Benefits Law: https://www1.nyc.gov/site/dca/about/commuter-benefits-FAQs.page. Washington DC Commuter Benefits Ordinance: http://info.commuterbenefits.com/hubfs/DC-B20-0573-SignedAct.pdf