Do you mean just move into a hotel a few days before the 90 day is due so you have a TM30 from the hotel or guesthouse. Should be OK but will the hotel etc give you a TM30? Some immigration offices want a physical paper while others are just fine with it registered on the system. PS: Why are you trying to do the TM30 yourself in the first place?
Anonymous participant Who is reselling? Look or ask in other groups. People will tell you they put property up for sale and not a viewing in months. Is it agents telling you is is a lively market? Why are there 500k or more empty condo units in Bangkok. Been plenty in the press about it in just the last week.
It depends on the reason. If you have the money and intend to use it a long time then why not. If it is for capital gain or rental income there are better investments. There are 100's of thousands of empty unsold condo's in Bangkok. There is a reason for that.
Cost of a B is 1900 and a WP is 3000. If you use an agent they will obviously charge more. I did not go from DTV to a B but from O to B I had to leave country and apply outside. My O had to be cancelled before I could apply for a B. It might be different for a DTV so do not quote me.