At least two residential care facilities in San Francisco that provide long-term care for 26 vulnerable people — some elderly, others formerly homeless — plan to shut their doors in the next few months, the latest in a spate of board-and-care closures around the city.

Officials with both facilities say they’ve been socked by the rising costs of doing business in San Francisco and a stagnant state reimbursement rate to run the homes. They also cited increasing difficulty in hiring and retaining staff. The two homes are Tiffany’s Care Home in Bernal Heights, which serves the elderly, and Parkview Inn #1 in Haight-Ashbury, which houses people who were formerly homeless and struggle with mental illness and substance abuse.

The two closures are part of an alarming trend that’s contributing to the city’s homeless and mental health crisis — the rapid disappearance of residential care beds for the elderly, mentally ill and those with substance abuse problems. San Francisco has lost more than a quarter of its board-and-care beds since 2012, according to the city’s working group on the problem. The operators say that many facilities are closing because the landlords are selling the properties in San Francisco’s hot real estate market, or because the costs to run the homes are outstripping revenue.

In the wake of the latest planned closures, Supervisors Rafael Mandelman and Norman Yee introduced a resolution at Tuesday’s Board of Supervisors meeting that they hope will discourage more board-and-cares from shuttering. The resolution would require a special permit if a landlord wants to change the board-and-care home to a different use, such as a single-family home. The new rule would last 18 months.

“Residential care facilities, or board-and-care homes, have for decades provided stable housing to our vulnerable population of seniors and people with disabilities,” Mandelman said at Tuesday’s meeting. “This is an urgently needed stopgap measure to preserve a crucial component of our city’s housing stock for our vulnerable, sick and elderly residents.”

The Department of Public Health said it will help find placement for the displaced tenants, six from Tiffany’s Care Home and 20 from Parkview Inn #1. But finding another long-term housing option for these people will likely be difficult in a city where such facilities are increasingly hard to come by.

“These are people who need help. We wash their dishes, clean their rooms, give them their meals, make sure they take their medicine,” said Karen Balingit, the bookkeeper and payroll manager for Parkview Inn #1 at 969 Buena Vista Ave. But “we can’t sustain the expenses.”

Board-and-care facilities are home-like environments for the low-income, mentally ill and elderly. Licensed board-and-cares receive monthly rent from the government, and tenants often help pay for their care through their Supplemental Security Income checks, which is a combination of federal and state funds for people with serious mental illness.

Balingit said Parkview Inn #1 has been struggling for a “long time,” but has clients who have lived there for upward of 20 years. The facility will likely close by the end of September. It is unclear what it will be used for next, but the owner of the home said she would be open to selling the home to a buyer.

Antonia Pahed, landlord of Tiffany’s Care Home at 50 Tiffany Ave., which serves the elderly, was extremely upset over the planned closure. Some tenants have also lived in that facility for more than 20 years, she said.

“It is a shame,” she said. “It is a pity for the old people.”

Pahed said she ran the facility for years, but gave up the property to the current operator around 2008 after she grew too old to run the facility on her own. Over the years, she said, the cost to run the facility had increased, including maintenance and personnel costs. She said closing the facility was the decision of the operator, who could not be reached for comment.

Now Pahed said she plans to rent out the rooms in the home, which will bring in much more money. But still, she said, she is sad that her current tenants must move out.

The latest closures come despite a $1 million investment by Mayor London Breed last year to assist residential care facilities. That investment increased the local subsidy for most facilities from $19 a night to $21 a night.

Broken Care: About this series San Francisco spends nearly $400 million a year on mental health and addiction treatment, but thousands of people in crisis are still without sufficient care. In this ongoing series, Chronicle journalists investigate the failures of this complicated, costly system and explore solutions to the crisis.

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The closures also come two weeks after the Department of Public Health came under fire after news surfaced that dozens of long-term beds have been sitting empty at San Francisco General Hospital’s Adult Residential Facility for more than a year — despite the demand for more long-term housing for the mentally ill and homeless.

Those beds were empty because the department said it could not hire enough staff to help run them. Instead of figuring out how to operate the existing beds, the city plans to turn them into temporary respite beds.

On Tuesday, Mandelman also requested that the City Attorney draft legislation requiring the Department of Public Health to “open and fill” all 55 ARF beds at SF General by June 30, 2021 — the date on which the suspension on the 41 beds will be lifted, he said. Supervisor Hillary Ronen, however, called for more immediate action and said the beds should be filled much sooner.

Kelly Hiramoto, director of transitions for the department, said she recognizes the challenges of running these facilities and said the city is taking a “deeper look” at how to support board-and-care operators in the city.

“The real estate market is very challenging,” she said. “We have a lot of developers coming to the homes and offering them lucrative deals to stop being board-and-care homes, and it’s challenging because it’s such a vulnerable population.”

Trisha Thadani is a San Francisco Chronicle staff writer. Email: tthadani@sfchronicle.com Twitter: @TrishaThadani