if the title is non-HDA then u can't convert to hostel or in summary you can't stay overnight (for long term). mayb you can try to apply for the permit

the different of HDA and non-HDA is keyword: "stay"

usually propety that compliance to HDA: terrace, bungalow, condo, apartment of certain SOHO

non-HDA: office lot, retail lot, SOFO, SOLO, SOVO, and some SOHO

as you can see, you yourself wont stay in office or retail for long term

some prop agent very bad, especially when you ask them this prop can do AirBnb or hostel business, the agent told u "Yes, overnight"

but mind the word "overnight" mean thou you can stay overnight in ur office/retail as you might need to rush for work but definitely you aint going to stay for week or month.