I can't comment on Manchester as I'm not familiar with the area.
But I'd urge you to only buy in an area you know fairly well.
I am personally not a huge fan of newbuilds. At least in London, my experience is that buyers rarely, if ever, recover the newbuild premium.
I am also very, very sceptical of newbuild leaseholds: typically leaseholders have no say whatsoever in the appointment of the managing agent and in all the costs of the building. In the civilised world, if a managing agent does a terrible job and wants to increase its fees, residents tell him to get lost. In feudal England, that is not possible: the managing agent is chosen by the freeholder, which often appoints a sister company that does all the jobs at inflated prices. In the most egregious cases, leaseholders might win a court case - there was a landmark case in Vauxhall (London) https://www.leaseholdknowledge.com/st-g ... 1-million/
- but there are no guarantees. In the vast majority of cases, leaseholders have to suck it up. My gripe is not only with the cost itself, but with the unpredictability of future increases.
There are some cases where leaseholders have control, eg where they own a share of freehold, but they are rare, and even rarer with newbuilds, because this is a huge revenue stream for developers, so they'll never give that up unless forced. The paradox is that the legal framework to fix this already exists (commonhold) but no developer will adopt it unless forced by law.
Lastly, OP, you really need to run some numbers. If you are not capable of doing that yourself, then you'd need a friend / relative / accountant / financial advisor to help you out. You need to put some numbers in a spreadsheet and calculate a few scenarios: if all goes well, how much can you make every year? What kind of situation would cause you to lose money? Eg if the boiler breaks down and you have 6-8 weeks without rent in between tenants? If the tenant stops paying, your savings can cover the expenses for how long?