There's a lot of threads on this - why don't you check those out first then come back with any questions, thoughts, etc?
Some of the NRAS stock can be overvalued. Some investors rely on the incentives to be able to hold the property. If the property is sold at fair market value and affordability stacks up at not factoring the government incentive then all good. Also some of the stock I've looked at in the past was in low growth areas. - consider resale value. You don't want to be stuck with a non performing property that has reached the valuation you purchased it for in 5 years time.