My daughter's friends have moved out due to lease expirations

There were seven kids in the same class at the daycare center within our complex.
Since this is a newly built complex, there is a fairly high proportion of young couples with children. (Jeonse prices were quite low during the initial move-in period)
Two years have passed since we moved in, and the friends my daughter was close with have moved out because the landlords are moving back in.
The moms were all close, so my wife is feeling the loss, and my daughter keeps asking where certain friends went. T_T
Fortunately, we were able to use our contract renewal right to secure another two years.