The standard answer for a warm white is SW Alabaster, although even that might be too bright a white to go with the fireplace surround. The current wall color is fighting the fireplace surround because it's cool with warm. Don't double down on that and repaint your walls a cool white. You might need a warm off white to make this work. There are no shortcuts for paint selection. Get a selection of chips from your preferred manufacturer and look for colors that are possibilities. (If you're using a painting contractor, ask them which vendor they use so you don't waste your time choosing a color from the wrong source. Colors aren't always as easy to copy from one manufacturer to the other as some people think.) Once you have a couple good candidates, move to larger samples, either using Samplize.com, or painting boards you can move around the room.

I would choose SW Alabaster, a great compliment to what you already have.

It is difficult to see the cream color in the fireplace. I would not choose a Super White BM that would be too crisp and stark.

You might grab some samples of white paints small cans and paint large cardboard pieces to see which white could work with the fireplace. And of course the beautiful built ins you have. I see you have some lovely white shells on the shelves. When you start narrowing down the white you want be sure it works with those lovely pieces that can help you too.

Choose the best white paint HOUZZ

Check out this white tie by Farrow. A creamy white that works with the orange and blue tones with a coastal vibe.

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notice how nice the white trim looks with the creamy tile. Find the right white is key

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White Dove BM

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another white dove BM this works nice with the blue green ad cream

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Do you know the name/number of the blue-green paint color on the built-ins?