Some luxury buildings have hired feng shui experts to help arrange harmonious spaces. Others recruit fitness experts to craft gym amenities. But a new Upper West Side co-op development called in a “kosher consultant” to advise it on how to ensure that the project would be attuned to the needs of observant Jews.

To keep kosher at the strictest level, some Jews commission extensive renovations to install double kitchen sinks and two dishwashers — one for meat, the other for dairy. At the Chamberlain, at 269 West 87th Street, however, all that infrastructure is already installed.

The Chamberlain, of course, welcomes all buyers — provided they can afford $2.4 million to over $10 million for the two- to five-bedroom apartments. The Fair Housing Act, which prohibits discrimination against buyers and renters, requires that apartments be marketed to the general population. But the 39-unit project is one of a handful of luxury buildings from developers who are differentiating themselves by taking into account the tastes and needs of a specific subset of the population.

In Flushing, Queens, the Grand at SkyView Parc, a 750-unit condominium from Onex Real Estate Partners, has appealed to Asian buyers with a park designed according to the principles of feng shui and brokers who speak fluent Mandarin.