You can increase supply but investors would just snatch them up. Maybe the feds could put a cap on the value of a single-family home that an institution can own and then make ownership very tedious. For example, no institution can own a home valued at more than $500k and for each home owned a quarterly filing must be made in person at the county the home is located. I'm sure these organizations would rather own very high value homes than lots of low value ones out in BFE.