@php
    $flats = \App\Models\Flat::query()
        ->select('floor')
        ->groupBy('floor')
        ->where('building', request('building'))
        ->get();
@endphp

@foreach ($flats as $b)
    <div id="building_{{ request('building') }}_floor_{{ $b->floor }}">
        <a href="?building={{ request('building') }}&floor={{ $b->floor }}">{{ request('building') }} / emelet:
            {{ $b['floor'] == 0 ? __('Fsz') : $b['floor'] }}.</a>
    </div>
@endforeach