Some fantastic advice in this thread esp @Peterw42 and others.
My post not so specific and factual. Just some observations based on 3 purchases in last couple of years.
First observation is that the land office where you do the transfer is amazing. So simple compared to my joint Oz.
As Peterw42 pointed out earlier they very carefully make sure the sale has all the boxes ticked off.
clear title etc.
All 3 times I didn't use a lawyer.
Didn't even consult one.
Recent purchase I didn't look into the common fee (yes stupid) later to discover expensive.
Fortunately that condo was large and being on older side had a team of tradesmen that did most of the makeovers.
Fortunately turned out to be gems and used them on unrelated townhouse makeover.
OP, as for sale price....I found Thai very different ideology than western folk.
In Oz (and elsewhere) we have a saying ..."it's worth what someone is prepared to pay"
Thai dont think that way imo.
OP, did you consider just putting the condo in wife's name?
I had no qualms