Looking at this from a tax point of view the main things is not to proceed blindly ahead cashing in all your pension if the tax result will be something that doesn't suit you or you aren't aware of.
So particularly to the extent that drawing from your pot would put you into higher rate tax for a particular tax year , delaying withdrawal till a later tax year could be of benefit.
The same can apply if you will not be using all your personal in future years by drawing a pot in the full, you could delay some withdrawals to make use of those later tax free allowances. However the fact that you have rental income and will be increasing this makes me think this will not be an issue.
Note this is purely looking at the tax side of things you need to speak to your pension provider / IFA to see if there are particular pension related issues - eg can you even cash in your pension fully flexibly without suffering extra fees?
Having read a lot on the internet on tax and business with property am a 'Landlord' of a number of properties the HMRC see that as a 'Commercial' business'
Not necessarily from the tax side of things it has always been up for discussion where a trade starts but in principle lots of individuals have 3/4/5 investment properties that run on the basic "rental investment income rules" where the income is not deemed to be that of a sole trader.
Practicably speaking as you are reaching state pension age soon even if NI did apply (sole trader) the effect on you would be nothing once you have a clean tax year past retirement age.
PS congratulations on reaching the retirement position - time to enjoy the best you can