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San Francisco is the softest spot in the Bay Area’s mostly booming real estate market, and its condo segment is weakest of all.

Inventory has been growing faster than sales, and price reductions — mostly in the condo segment — “have hit very high numbers,” said Patrick Carlisle, chief market analyst for the Compass real estate brokerage firm. So why hasn’t the median price for a San Francisco condo shown a bigger drop?

The median price paid for a San Francisco condo fell to $1.25 million in the third quarter, down just 2% from the third quarter of 2019, according to Carlisle. The median price for a single-family home rose 5.2% to $1.66 million.

The big reason condos didn’t drop more: Sales of two-bedroom units went up considerably — to 330 from 230 — year over year, while the number of one-bedroom condo sales dropped slightly, to 186 from 183.

“The increase in two-bedroom sales pulled up the overall median condo sales price,” Carlisle said. When you look at one- and two-bedroom units separately, their median prices fell 6.6% and 6.5%, respectively, “which rings much truer.”

This shows why looking just at median prices, the point at which half of homes sold for more and half for less, can be misleading.

Carlisle found “a similar dynamic regarding median house sales prices around the Bay Area in the third quarter.” The average size of homes sold in the Bay Area in the third quarter “jumped virtually everywhere, very generally in the 5% to 10% range. Bigger houses sell for more money, raising the median sales price.” That’s not a true reflection of market values, or what an individual house might sell for.

Although market values did go up in most areas, “a significant proportion of median price increases were simply due to bigger houses selling,” Carlisle said. “Affluent buyers have been playing a larger role in the market since the pandemic.” His data is based on sales reported to a Multiple Listing Service.

Even in a soft market, buyers are facing stiff competition in some segments. One way to measure “hotness” is by looking at the percentage of homes that go into contract, meaning the seller has accepted an offer. By this measure, the hottest condo markets in San Francisco in the third quarter were Noe/Eureka/Cole valleys (47% percent acceptance rate), followed by Richmond District/Lake Street (45%).

The coolest were South Beach/South of Market/Mission Bay (18%) and Russian/Nob/Telegraph hills and Van Ness/Civic Center/downtown (tied at 23% each).

For single-family homes, the hottest San Francisco neighborhood was Sunset/Parkside/Golden Gate Heights, where 68% of homes went into contract in the third quarter. The coolest was Pacific Heights/Cow Hollow/Marina (28%).

Another measure of hotness is the average amount by which the sales price exceeds the original list price, also known as overbidding. Here too, Sunset/Parkside district led the way for single-family San Francisco homes, with buyers paying 9% on average more than the list price in the third quarter. The coolest was Pacific Heights/Presidio Heights/Cow Hollow/Marina, where the average buyer paid 4.6% less than asking.

Sunset/Parkside “is extremely hot,” said agent Jason Chan of Barbco Real Estate. “I’ve been getting on average 10 or 20 offers on my listings (there). They are usually going about 40% over asking.” He admitted that agents in the city are pricing homes well below market value because if they price them at market value or slightly above, “they end up sitting on the market for weeks or months.”

He listed a small house at 2101 Wawona in Parkside at just under $1.1 million. It got 22 offers and sold for $1.5 million.

Compass agent Yesenia Rogers said Sunset/Parkside is a good alternative to the suburbs for people who are mostly confined to their homes during the coronavirus pandemic and want a yard and space for an office or classroom. “It’s where you can get a single-family home in that $1.5 million range that’s going to allow for space, three bedrooms, a backyard, in a nice, safe community,” she said.

Rogers is working with three buyers who are “actively writing offers” in that area. All are renting condos and want single-family homes for children at some point. “These are people who believe in San Francisco, believe the city is going to come back, and maybe not the way it once was, but San Francisco does remain a good investment.” Some want to stay close to relatives in the city.

This past week, her buyers bid on one house that got 12 offers and another that got 20. “There is a lot of inventory on the market” in San Francisco, and sales “are pretty hot and cold,” Rogers said. “I don’t think (the Sunset) is an area where you will constantly get beat out. But compared to other parts of the city,” it’s competitive, she said: Homes with three bedrooms on one level “will see a lot of offers.”

While the average single-family home sold for 2.4% more than the asking price in the third quarter, the average San Francisco condo sold for 2.6% less. The best condo neighborhood was the Richmond District, where the average unit sold right at asking price; the weakest was Russian/Nob/Telegraph hills/Financial District, where the average unit sold for 7% less than asking.

Surprisingly, some parts of the Bay Area that have been hardest hit by wildfires and power shut-offs were among the “hottest” in the third quarter.

Carlisle compared the percentage of homes (single-family and condos combined) that went into contract during the third quarter of 2020 to the same quarter last year for the Bay Area and a few surrounding counties.

In the third quarter of this year, by itself, the counties with the largest percentage of homes going into contract were Solano, Contra Costa and Alameda.

But the counties that saw the biggest percentage change in this number year over year were Monterey, Santa Cruz, Napa and Sonoma. This is another way of measuring hotness.

“San Francisco is the only county that saw a decline,” Carlisle said. Its share of homes accepting an offer dropped from 41% last year to 36% this year.

Kathleen Pender is a San Francisco Chronicle columnist. Email: kpender@sfchronicle.com Twitter: @kathpender

Housing rents continue to decline in the Bay Area amid the coronavirus pandemic, especially in San Francisco, which has notoriously had the country’s highest rental prices after overtaking New York City years ago.

According to the most recent reports from private listing websites Apartment List and Zumper, rental prices have plummeted 20% in the city so far this year compared with the same time last year.

Zumper found the median cost of a one-bedroom in San Francisco last month was $2,830. The company analyzes rental data from more than 1 million active listings across the country. It includes new construction and excludes listings that are currently occupied or no longer available.

“Not only is this drop among the largest yearly decreases Zumper has ever recorded in our history of tracking rental prices, but it was also the first time the median one-bedroom price in San Francisco dipped below $3,000,” said data analyst Neil Gerstein in an email. “These combined trends show just how drastically the market has changed in the nation’s most expensive city to rent.”

Apartment List reported a considerably lower September median cost for a one-bedroom in San Francisco, at $2,240. The median for a two-bedroom apartment was $2,590, a 5.2% decline from the previous month. Its methodology differs from Zumper’s: It starts with statistics from the Census Bureau and Department of Housing and Urban Development, and it includes rents for older units and those in lower-income neighborhoods.

By either measure, the Bay Area continues to be the priciest market for renters in the nation. Zumper found that the top five rental markets in the country includes three Bay Area cities: San Francisco tops the list, with San Jose and Oakland coming in fourth and fifth, respectively.

San Jose’s rental prices haven’t changed much from last month at $2,230 for a one-bedroom, and decreased 1% for a 2-bedroom at $2,770. In Oakland, the median cost for a one-bedroom declined 3% to $2,130, and decreased 1% for a two-bedroom to $2,770.

Nationally, Zumper listed New York as the No. 2 most expensive rental market and Boston as No. 3. New York’s rents dropped 4% from the prior month to $2,600. Gerstein said that while New York City has also had historic price drops during the pandemic and renters appear to be taking advantage of declining rent in both cities, there is a notable difference.

“New York’s migration inflows have returned to pre-March levels, while San Francisco’s have not,” he said. “Both cities continued to experience large migration outflows, but the differences in the two cities’ migration inflows may explain their diverging price trends and could lead to rental prices in New York stabilizing faster than in San Francisco and overtaking the top spot.”

And nationally, Zumper’s report shows a decrease of 0.1% from the previous month for a one-bedroom to $1,231, with the year-over-year decline at 0.6%.

In the San Francisco metro area, Apartment List showed Oakland had the least expensive rents, at $1,770 for a one-bedroom and $2,090 for a two-bedroom.

A number of East Bay cities did not see much of a rent decline from the previous year: Pleasanton and Walnut Creek each decreased only 0.1%, and Hayward went down 0.9%.

Kellie Hwang is a San Francisco Chronicle staff writer. Email: kellie.hwang@sfchronicle.com Twitter: @KellieHwang