If someone reports bed bugs
The area should be checked promptly and a specimen collected, if possible, for identification by a pest management professional.
Respond sympathetically to people reporting bed bug problems
Promptly contact a pest management professional experienced in bed bug control to confirm that bed bugs are present.
The inspection should include the unit in question, as well as units adjacent (with common walls), above and below, and directly across the hall.
Schedule every apartment that has been serviced for bed bugs for a follow-up inspection. Service each unit as necessary until there are no more bed bugs.
Continue with follow-up inspections in all apartments adjacent to infested ones until the primary infestation is eliminated.
http://www.ampmexterminators.com/Getting-rid-of-bedbugs.php