(a) Notwithstanding any other law, in all counties having a population in excess of 400,000 according to the United States decennial census of 1990 or any future such census, where the governing authority of the county has established and constructed one or more permanent satellite courthouses within the county and has designated each structure as a courthouse annex or by similar designation has established each structure as an additional courthouse to the courthouse located at the county site, the judge of the probate court shall be authorized and empowered to keep and maintain his or her office or offices and all things belonging thereto at the additional courthouse locations and at the courthouse at the county site. Any and all actions taken by the judge of the probate court at any additional courthouse location, however same may be designated, which is established by the county governing authority and designated as an additional courthouse location shall be as fully valid and binding as though taken and performed at the courthouse at the county site. Nothing in this subsection shall authorize the maintenance of any permanent records at any location other than the courthouse located at the county site.

(b) Notwithstanding any other law, in a county where the county site is located in an unincorporated area of the county and the county governing authority has constructed one or more permanent satellite courthouses within the county and has further designated each such structure as a courthouse annex or has otherwise established each such structure as an additional courthouse to the courthouse located at the county site, the judge of the probate court shall be authorized and empowered to keep and maintain his or her office or offices and all things belonging thereto at the additional courthouse locations and at the courthouse at the county site. Any and all actions taken by the judge of the probate court at any additional courthouse location, however same may be designated, which is established by such county governing authority and designated as an additional courthouse location shall be as fully valid and binding as though taken and performed at the courthouse at the county site.