nginx version: nginx/1.10.3 (Ubuntu)

upstream php {
    server unix:/var/run/php/php7.2-fpm.sock;
}

server {
    charset utf-8;
    client_max_body_size 1M;

    listen 80;

    server_name domain.ru;
    set         $root /var/www/domain;
    root        $root/web/site/web/;
    index       index.php;

    disable_symlinks off;

    access_log  /var/log/www/domain/site-access.log combined buffer=5M flush=5m;
    error_log   /var/log/www/domain/site-error.log;

    if (-f $document_root/maintenance.html) {
        return 503;
    }

    location / {
        try_files $uri $uri/ /index.php$is_args$args;
    }

    location = /blank.gif {
        empty_gif;
    }

    location ~ ^/assets/.*\.php$ {
        deny all;
    }

    location ~ ^/fetch(.+)$ {
         internal;

         fastcgi_pass php;

         fastcgi_store        on;
         fastcgi_store_access user:rw group:rw all:r;
         fastcgi_temp_path    /tmp 1 2;

         alias $root$1;
    }

    location ~ ^/images/([avatar|building|block|offer|floor].+\.[jpg|jpeg|gif|png]+)$ {
        expires 1y;
        error_page 404 403 415 /blank.gif;

        valid_referers none blocked server_names ~\.domain\.ru ~\.google\. ~\.yandex\.;

        if ($invalid_referer) {
            return 403;
        }

        root $root;
        #error_page 404 = /fetch$uri;
        try_files $root$uri /fetch$uri;
    }

    location ~ (.+)\.(css|js|svg)$ {
        charset_types *;
        expires 1y;
        gzip_static on;

        try_files $1.min.$2 $1.$2 $uri;
    }

    location ~ ^/sitemap.*\.xml$ {
        expires modified 1d;
    }

    location ~ \.php$ {
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_pass php;
        try_files $uri =404;
    }

    location ~* /\. {
        deny all;
    }
}

=======

/var/www/domain/images # tree
.
├── building
│   └── 73
│       └── 3a
│           └── zhk-bauman-house-1200x404.jpeg
└── original
    └── 90
        └── 36
            └── 9036870d5f51611d3f61eaecb12948cb0d45e5a4

file /var/www/domain/images/building/73/3a/zhk-bauman-house-1200x404.jpeg
/var/www/domain/images/building/73/3a/zhk-bauman-house-1200x404.jpeg: empty