If a tenant fails to provide a forwarding address to the landlord to enable the landlord to make a refund of the security deposit, upon the expiration of one year from the date of the end of the 45-day time period, the landlord may remit such sum to the State Treasurer as unclaimed property on a form prescribed by the administrator that includes the name; social security number, if known; and last known address of each tenant on the rental agreement.

@AJ StanisYou've encountered a common issue in a trust administration. 

I only contact the person who the Letters of Administration have been issued to. 3.

Any changes to the full retirement age will be enacted as amendments to the Social Security Act of 1935 and will be implemented by the Social Security Administration.

Several administrators have a couple of fee structures that may work differently for the circumstances of different geographic areas and real estate values.

An administrator could sell you the property once appointed. 

I understand that SD IRA custodians are regulated where TPAs are not, and this introduces risk when using a TPA.  What specific risk and how much of it exists in practice when working with a well established TPA like ...

Because the state administration changes every four years, there is a very high population of renters with solid credit.  

Who do you use as an administrator?

If a plan accepts an invalid rollover contribution ... if the plan administrator of the receiving plan later determines that the contribution was an invalid rollover contribution, the amount of the invalid rollover contribution, plus any earnings attributable thereto, is distributed to the employee within a reasonable time after such determination.