Well ill try what I can. If you have only put a booking deposit drag it out long enough until you have done your research and are happy. If its non refundable it may still be worth looking at taking the hit if the numbers dont stack up.
If you have a say10% deposit down and you research looks grim then you have tough decisions.
If you are all signed, sealed and delivered so to speak all you can do is get cracking and ensure you get it tenanted asap.
5% return on capital does not sound like much esp with interest rates further rising and obviously you would rely on 100% tenancy to break even...
Remember the overheads of: legal fees, Fitout, your own time, rental fees,sales agent fees, sales legal fees, advertising, CGTs, stamp taxes and non tenanted time all have to be dedcucted from any appreciation. You would want to have very good capital appreciation to ensure any form of profit.
Apologies for the initial reaction, like Clubman was take aback.