The letter, dated October 11, states that each of the four businesses has undergone "flagrant drug dealing, fires, and vandalism, verbal and physical threats as well as actual assaults" over the last several months.
One of the businesses, Lan Su Chinese Garden, said that three of their staff members were assaulted in a single day in September.
"This was just one of a list of events that prompted the difficult decision to hire additional security and lock the front gate. The Lan Su Chinese Garden hosts 2,000 visitors each week and cannot honestly assure their health and safety under current conditions," the letter reads.
"It makes all of us want to cry. That's what we were trying to communicate to our leaders of this city and this country. Our hearts are broken," Elizabeth Nye, executive director of Lan Su Chinese Garden, told KATU.
"Old Town and the New Chinatown/Japantown Historic District was once home to the largest population of Cantonese-Chinese outside of San Francisco and one of the two Japantowns in Portland. Jewish merchants managed and owned businesses in the neighborhood," the letter said.
"Our four organizations were founded to preserve an important part of Portland's history and to celebrate the diversities of our city. Local government's inability to protect this neighborhood disrespects this history."
"It's past time for you to take the necessary action to fix the city we all love," said the letter, which requests that city leadership meets with the organizations no later than October 22, "to discuss your commitment to lead and the specific actions you support for Old Town."
"We need to hear the city's plans for adding police and combating rising crime and we need the county to step up and deploy mental health professionals and services to our neighborhood, which was recently described as an 'open-air psychiatric ward,'" the letter added.
Lan Su Chinese Garden signed the Japanese Museum of Oregon, the Oregon Jewish Museum and Center for Holocaust Education, and the Portland Chinatown Museum.
According to KATU, Commissioner Dan Ryan released a statement spending the letter.
"I want to thank Lan Su Chinese Garden, the Japanese American Museum of Oregon, the Oregon Jewish Museum and Center for Holocaust Education, and the Portland Chinatown Museum for speaking their truths regarding the untenable state of Old Town and their safety concerns," wrote Ryan.