If I remember you are located near PKCP.
I bought off Ratanakorn, PKCP and Centre Point, great location, nice area, close to everything.
I've never lived in my condos, mostly had them rented. I tried to avoid the annual agent fees (1 months rent) so I would go and see the tenant personally with a lease, have it completed each year, tenant and landlord (myself).
Contact the owner, make an appointment, sign a new lease.
It's high season now, finding new accommodation in good location at a reasonable price not easy.
Good luck.