The commercial interest rate is roughly similar, but also depends on the loan size amount.

The difference is that the tenure is slightly shorter, max 25 - 30 yrs depending on the banks.

It depends on the refinancing, if you plan to keep your house and invest some $ into the commercial property then you may do the refinancing to cash out some extra money. However need to consider your maximum DSR.

rates could be going from 4.45% ++ depending on loan amount

It depends if you want to loan extra depending on your income able to take in the extra installment, the extra could be used for renovation or rolling the business purpose.

for more than 30 years tenure, not that I know of at the moment for other banks.

Well if you got money to pump into ur loan  in the future then take a semi flexi. Furthermore the rate is lower than option 2.

Dear,

1 and 3 will be a feasible options, except if no.2 come with additional clauses that suits your needs

1. OD
-interest rate is higher, however, if you r amount doesn't exceed RM200K, there's no interest charges on the unutilized amount . PROS

-However, bank has the option to withdraw your cash anytime, that's the CONS

2. 3) semi flexible loan

- cash out interest rate is very low. (PROS)

- installment start on the first disbursement, in 1month time

- Cash out amount credit into the loan account will help reduce interset charges, which will offset the charges

- Bank can't withdraw your cash anytime they want like OD.
3 Do compare the above and draw your own conclusion base on few of my brief points

Cheers