1. INTRODUCTION

2. OPTICAL/NIR IMAGING
2.1. Imaging Observations
2.2. Data Processing

3. METHODOLOGY
3.1. Photometric Redshifts
3.2. NIR Overdensity Estimates for Unconfirmed Candidates

4. RESULTS
4.1. Redshift Distribution
4.2. Purity of the SPT Cluster Candidates
4.3. rBCG Offsets in SPT Clusters

5. CONCLUSIONS