Often this can be done easily by either a) an addendum to the current lease or b) mutually deciding to terminate the lease and enter into a new lease.Typically rent on a unit will be based on the square footage of the unit and a maximum number of occupants.

Square footage seems to be in the 800-1200 range in that area as well with some scattered newer builds from the late 90s and early 2000s.   

Square footage is important.

Everyone seems to recommend separate bank accounts for the business (as landlord, collecting rent, paying expenses, repairs, etc) and personal.My question is, since I live in the small unit (maybe 40% of the sq footage of the building) and rent out the other 60%, it's unclear which account I should use for the roof replacement that is going on right now. 

Also, the gas bill is spilt on a square footage basis with the upstairs tenant.

A duplex would be perfect but I would like to be in a nice neighborhood, and have decent square footage.

Most deals are coming from equity sellers, investors creating value (new construction, ADUs, adding square footage, etc.), and very last is MLS.

Most common is to divide the value by square footage. 

However, in my experience, the average cost for residential appraisal reports is between $375 to $500 (unless the property exceeds a certain price point, square footage, or lot acreage).   

Other homes with the same floor plan and square footage in the subdivision have recently sold from $380k to $493K.