Need an extra set of eyes

Why is there a '%' instead of a '$' in "%fontage"?

Fortunately all of the PHP functions are documented in the online man pages.  Example here, showing the mysql_query() function.
http://php.net/manual/en/function.mysql-query.php

When you get to the warning and discover that PHP is doing away with MySQL support, you may find this article helpful.  It shows how to make the required upgrade from MySQL to one of the supported extensions.
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/PHP_Databases/A_11177-PHP-MySQL-Deprecated-as-of-PHP-5-5-0.html

Did you cut and paste that from your code or type it in - because there are so many things wrong with it as has been pointed out in previous posts it is not surprising it does not work.

The only change I would make to Gary's post is to use single quotes instead of double around the strings - just makes for a neater look but that is personal preference.
Unless you are using multiple connections you don't have to specify the link resource in the mysql_query call
I also have developed a habit of putting {} around my in-string variables - it is not necessary but it does help to highlight where the variables are.

mysql_query("UPDATE mapfile SET TYPE ='{$type}', TENANT = '{$tenant}', FRONTAGE = '%fontage', SIC = '$sic'
            WHERE SEQ = '{$Building_Id}' and STOREKEY = '{$Space_Id}'"); 

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And as Ray mentioned in his post post 5.5 the mysql library is no longer supported - mysql lib calls will simply fail - I would consider moving over to mysqli.

Beyond that - try getting the query to work in a query editor SQLYog, MySQL Workbench or PHPMySQL - once it is working there translate it back into your code.

Here is a good way to write a query - construct it in a PHP variable, instead of loading it into the function call.  That way you can visualize the query and you don't have to guess about what might be wrong.

$sql = "SELECT col FROM myTable WHERE name='Ray' LIMIT 1";
$res = mysql_query($sql);
if (!$res)
{
    var_dump($sql);
    echo mysql_error();
    trigger_error("QUERY FAILED", E_USER_ERROR);
}

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Thanks.
I has a bad day yesterday and I couldn't see it.
You ever had one of those where you stare at the code and you can't see it.
Glenn