“Is the new building owner responsible at all for raising my panels?”

“Dear PoPville,

I just got a letter in the mail from DCRA notifying me that the house next door will be converted into a popup. This will block the sun from hitting my solar panels for at least half the day. Is the new building owner responsible at all for raising my panels? Or will I just expect to lose half my power generation?

Also, should I be concerned at all about their intention to excavate a basement and underpin our shared wall?”