Fixed interest rate co-op share loans, relocation loans, loans with significant interest rate buydowns, and high-balance loans may be pooled separately under specially designated pool prefixes or may be commingled with other similar mortgages as long as they do not constitute more than 10% of the issue date UPB of the pool under a TBA-eligible prefix. If the pool has at least two or more of these features, the issue date UPB of the combination cannot exceed 15% of the UPB of the TBA pool. If the percentage exceeds 15%, non-TBA prefixes will apply. The 15% cumulative limitation does not apply to high-balance loans. For example, a TBA pool may contain 10% high-balance loans and 10% co-op share loans.
The following loan types may not be commingled in the same pool:
Government-guaranteed and government-insured loans may not be commingled with conventional loans.
The table below provides references to the Announcements that have been issued that are related to this topic.