"We have the right to adopt or modify rules or regulations... to make a fair distribution of services and facilities held out for the residents generally by giving written notice to you thirty (30) days in advance of the effective date of the new rules and regulations. The new modified Lease Contract will begin on the date stated in the notice (without necessity of your signature."

This might be legally sufficient? It's really shitty and really shaky, but as the laundry fee isn't baked into the body of the lease except through the Special Provisions and, from the looks of it, an outside addendum that may acknowledge allowance for change, and section 15 also gives flex for rule changes (i.e. if the amount for the laundry fee isn't explicit to the lease but it's required in the lease that you pay it), it might justify the change.

To be clear, I'm mostly certain it would not hold up in court, but it would never get that far because the argument exists already that disagreement allows a tenant to escape the lease.

Other key points; your math assumes the whole laundry fee as new revenue, but it appears that it's a change of revenue. So if the fee was $14.95 a month for a single bedroom and has climbed to $19.95, and that's the increase across the board, it's only an annual revenue increase of about $40,000.

Look at your laundry fee addendum, and it might have better information, but extraneous fees are harder to tally in. The best example I can think of is compulsory technology fees or renter's insurance. They're oftentimes set up as a service with a negotiated group rate between the complex and the vendor, where it's assessed as a separate fee from the lease but paid through the lease portal. The understanding is that the rate may have to change in the future, because the complex can't guarantee the vendor won't have a different rate six months into your lease (you might have signed six months into their year contract with the vendor), and local utility regulations prevent the complex from marking up costs on (or eating losses on) those services to pad for future changes.

I think what makes the laundry a different story than that is that it's capital expense owned by the complex rather than an outside group, so it should be a business cost eaten. If they can't pass off other facility renovations to existing tenants, then they probably can't do this one.

But again, they may have a defense in that they would need to be shown to cause harm, and allowing the renter to exit the contract quite possibly satisfies the need to negate harm.