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$(".select select" ).change(function() {
    $(".select select").css('color','#000');
});

<div class="select">
            <select>
                <option value="" disabled selected>Looking For...</option>
                <option class="nms" value="">Office Space</option>
                <option class="nms" value="">Warehouse Space</option>
                <option class="nms" value="">Manufacturing Space</option>
                <option class="nms" value="">Retail Space</option>
                <option class="nms" value="">Others</option>
            </select>
            </div>

select{ 
    color:#A9A9A9;
}
.select option {color:#A9A9A9;}
.select option.nms{
    color:#000;
}