Deductions & credits

I should describe more,

 

In 2020 we built a 2nd house in the backyard of a property we rent consitently, costing $350K.

 

This 2nd house was not rented out in 2020 because it wasn't completed.

 

The $350K spent, wouldn't that be a LAND IMPROVEMENT? We would like the $350k as a Depreciation.

 

Or, because the front house continued to be rented during this period, I would mark it as RENTAL REAL ESTATE?

 

Thx