Splitting a parcel out of the mortgage

[Chris Smith]

In June I purchased my first property. 2000 sq ft dumpster home on just shy of an acre.  The home is zoned R-10 but there were two parcels combined for tax purposes back in the 80's. The county has said they can be split back for a filing fee because they were grandfathered in.

Question is, once I get to the last R in the BRRRR strategy. Is there a way to get this second, now vacant, lot off of the loan so I can own it free an clear?

My mortgage says I cannot sub-divide the property and sell pieces of it, but is there a way to do this when refinancing?

If anybody has info or could point me in the right direction that would be great!

Thanks,