为什么核桃溪市不能建造带有游乐场的 3 居室公寓?
Why Can't Walnut Creek Build 3 Bedroom Apartments with a Playground?

原始链接: https://kevin.burke.dev/kevin/walnut-creek-single-stair/

位于 Botelho Drive 的一项新公寓提案凸显了核桃溪市(Walnut Creek)在规划和建筑规范上的系统性失败,即无法提供高质量、适合家庭居住的住宅。该项目依靠州政府的密度奖励政策来维持财务可行性,但最终建成的却是缺乏采光、通风和家庭适用户型的“双侧走廊式”单元。 作者认为,这些缺陷并非设计上的选择,而是过时法规强制导致的结果。过度的停车位要求占用了宝贵的空间,僵化的楼梯规范阻止了现代“单楼梯”设计的应用,而陈旧的电梯强制要求则推高了建筑成本。与哥本哈根等欧洲模式相比,核桃溪市的政策阻碍了高密度、阳光充足且适合家庭居住的建筑的产生。 作者敦促设计审查委员会不要接受平庸的裙楼式公寓,而应识别并改革这些限制性约束。通过更新停车标准、放宽楼梯规则以及倡导州层面的电梯改革,该市可以使开发商能够建造出价格合理、阳光充足并配备游乐场等设施的住宅。我们鼓励居民联系市政官员,要求将建筑设计转向优先考虑长期宜居性和社区需求的方向。

这篇 Hacker News 讨论聚焦于一篇质疑加州核桃溪市(Walnut Creek)为何难以建造适合家庭居住的三居室公寓的文章。 参与者就以下几个关键因素展开了辩论: * **监管障碍:** 许多人指出,美国严格的建筑法规(如双楼梯要求、超大电梯以及强制性停车位规定)是导致成本高昂和设计灵活性差的主要原因。 * **技术乐观主义:** 文章寄希望于自动驾驶汽车来解决停车问题,这遭到了严厉批评,被认为“脱离现实”。评论者指出,类似的预测十多年来从未实现。 * **文化与市场偏好:** 一个主要的争论点是,大户型公寓的缺乏究竟是监管问题还是文化问题。许多人认为,美国家庭历来偏好独栋住宅,这导致开发商无论建筑法规如何,都会优先考虑小户型,以获取更高的每平方英尺租金收益。 * **与国外的对比:** 虽然一些人认为亚洲和欧洲的模式更适合高密度居住,但另一些人指出,在美国物价较低的地区也存在类似的建筑限制,这表明当地住房市场、土地分区和社交偏好比单纯的国家建筑法规具有更决定性的影响。
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原文

Walnut Creek's Design Review Commission is reviewing a new apartment building on Botelho Drive across from the Habit this evening. Like every project proposed in Walnut Creek recently, it cannot be built under the city's normal zoning code, so it is using state density bonus law to waive laws around heights and setbacks that make the project financially unworkable.

Like every other podium apartment proposed recently it feels like a giant missed opportunity. I hope the Design Review Commission - and the city - can spend a bit more time thinking about, and trying to remove, the constraints that make it hard to produce a building that families can live in.

As someone with two young kids it's always been notable, and odd, that Alma Park, up the hill, has no kids facilities - no swing, no playground, no basketball hoop. This would be a great chance to try to fix that. But the proposed building has no three or four bedroom units, and the interior courtyard is going to struggle to get sunlight. The lack of three+ bedroom units means that there are going to continue to be few product types available in Walnut Creek for families. It is hard for a lot of people to afford a $1.5m single family detached house but if that is the only living option available that offers three bedrooms then that will substantially constrain who can live here and hamper young couples ability to have children.

Most of the apartments have a window on just one side. The interior facing rooms on the lower floors are going to have a lot of trouble getting light in. With a window on only one side, you can't ventilate your apartment by opening windows on multiple sides. This increases the demand for HVAC, which increases the cost of living.

Walnut Creek proposal floor plan showing interior corridors and mostly single-aspect units

It's possible to do better - a lot better! In other countries, you very rarely see this "double loaded corridor" design. Here's an apartment in Copenhagen, Denmark that is actually denser (149 homes/acre) than this proposal, and the same average height.

Copenhagen courtyard block aerial view

Look at this floor plan. Every apartment has windows on multiple sides and at least one balcony, sometimes two.

Copenhagen courtyard site plan showing apartments around shared open space

When you have windows on multiple sides it is a lot easier to offer units that have lots of bedrooms. This project has tons of family sized apartments. And when every room is multiple aspect you can do stuff like offer a 900 square foot one bedroom unit.

Copenhagen apartment floor plan with windows on multiple sides and balconies

The median household income here in Walnut Creek is $130,000 - more than double the median Copenhagen income - but there are zero 900 square foot one bedroom apartments here that have windows on multiple sides.

And when you don't need to dedicate as much interior space to circulation, you can have a sunlight filled interior courtyard. With a playground. Look how much light there is on this playground! This is a building my family could live in.

Copenhagen courtyard playground with direct sunlight

I really hope the city can spend some time thinking about why we can't design apartments in Walnut Creek with four bedrooms and sunlight and courtyards that have playgrounds in them. Here are some of the constraints:

  • Minimum parking: The parking requirements shape the whole design of the building but parking is about to radically change forever. In five years it will be possible to buy a car that can drop you off and then go park itself in an offsite garage. The onsite parking in this building has maybe a ten year useful life, in a building with a seventy five year lifespan. If we as a city were willing to be more aggressive about offstreet parking and encouraging other options - we could get much more livable buildings with cheaper rent.

    Some neighbors have complained about the building height, and this is also an answer for them. If we could cut the amount of space dedicated to parking we could cut a floor off the building.

  • Parking standards: All of the city's rules about aisle widths and stall widths and lengths assume a human is parking every car. A robot is capable of parking cars with an inch of clearance on both sides. A self driven car cannot block anyone in. "Humans park their own cars" will be true for maybe five more years and for the next seventy years of this building's designed life, the sixteen foot wide drive aisles, and nine foot wide parking stalls will age like sour milk.

    Maybe this building in 2026 can't assume robots are parking the cars. But we could change the city's rules now and maybe a building a year from now will be able to dedicate less space to parking.

    The global leader in self driving cars has a headquarters thirty miles from here - the city could invite someone from Waymo to give a talk on the future of onsite parking and how our codes should adapt.

  • Stairways: Walnut Creek requires buildings to have two stairway exits from all rooms, which is why there's an interior corridor, why most apartments have only one wall with a window, and why there are no three bedroom apartments - if you have three bedrooms facing a window you have too much unwindowed space in the interior. While sprinklers do a lot to help prevent fires, the evidence for the safety usefulness of the second staircase is mixed at best. Some of the apartments in this building are hundreds of feet from both staircases. Cities and states around the country are changing their rules to permit taller buildings with a single, fire-hardened stair and a balcony. Culver City (pop. 45000) legalized single stair construction up to six stories last year. We could ask their staff to give a talk on what they did.

    It's also worth considering the second order effect - when new buildings are so expensive this means more people are still living in older wood buildings that have lead paint and no sprinkler system at all.

  • Heights: The Copenhagen project dips down in the southern corner to let light into the courtyard. This project has an ideal southern exposure to do something similar, but when you are getting 80-85% usable floor space, paying $150k a unit in fees, and elevators cost $500,000, you can't afford luxuries like that.

  • Elevators: The US elevator code is different than the standard used in every other country in the world, so we cannot buy the same cheap elevators as everyone else. We also require every new elevator to be big enough to hold a 7 foot stretcher, because a fire marshal in Glendale, Arizona wanted to make sure that the elevators in the Arizona Cardinals football stadium could fit a stretcher. This means new buildings have fewer elevators, and they're more expensive, and they take up more floor space. The extra cost - both installation and maintenance - gets passed through as higher rent.

    The city could hold a study session to learn more about this problem, or meet with / write a letter to our legislators asking for reform.

I understand that these are hard problems. But it would be really helpful for a city commission to at least acknowledge that they exist, acknowledge that the poor quality of multifamily housing is a product of building and zoning regulations, and understand that other countries are able to produce affordable family sized apartments with far more sunlight and passive cooling, and start discussing the constraints that make those impossible to build here.

And if you want to live in a family sized apartment - send this post to your local commission or elected official, and ask them to pursue the changes that would make this possible.

I do not know how much time Rebecca Bauer-Kahan and Tim Grayson have spent this year thinking about the elevator code. But if a local city was writing them letters or getting stories in the local paper then maybe there could be more movement toward getting beautiful, dense, livable new buildings in Walnut Creek. (And a playground for Alma Park).

Comments can be sent to [email protected].

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