@Regina Bailey you can send the 5 day via certified mail.

Notice may be given by: (A) regular mail; (B) certified mail, return receipt requested; (C) personal delivery to any resident; (D) personal delivery at the property to any occupant over 16 years old; (E) electronic mail delivery to the email address used by the Tenant to submit the lease application.

You want someone self-certified to avoid delay from multidepartment review (there's a list of maybe 700 of these architects on the City site).

In signing this Lease, Tenant agrees that Tenant has examined the Premises and certifies that it has not observed any pests in the Premises.

Hiring a certified cost segregation specialist can provide additional insight to your situation. 

QIP has a depreciable life of 15-years and is also bonus eligible.Definitely consider speaking to a certified cost seg professional.

You need a certified arborist to write a opinion about the tree then send that  to the owner of the tree .

If we can't get an address to either party to mail a certified letter then a private investigator must be hired to locate them. 

I am all ears if anyone has any wisdom to impart to a newbie.So, I recently launched an LLC and I am working on getting it certified as a Woman Owned business; not sure if that will help in any way, but I figure it can't hurt.

A general maintenance tech or handyman may not have the expertise to certify a leak that is especially mysterious.