Landlord and Tenant-Increase of Rent (Restriction) Ordinance 1949-Section 31-Whether Supreme Court has concurrent jurisdiction with Coast Rent Control Board-Claim for arrears of rent-Whether damages by breach of contract, set-off or counter-claim competent-Alleged unreasonable withholding of landlord's consent to assignment of lease-Whether set-off or counterclaim for damages arising out of tort for loss of assignee competent.