Treatment of interest on home loan for a vacant property

yes you cn avail the benefit of rs 200000 u/s 24(b)

in case of loan for constructed property, construction should be completed maximum within five years (earlier this was 3 years) from the end of the financial year of loan. for example if loan has been taken in f.y 2015-16 the construction should be finished by 2020-21. thus in your case you have to check when construction of your house has been finished. maximum limit for interest amount is RS 2 lakhs and principle can be claimed u/s 80C for RS. 1.5 lakhs. also if your Delhi house is also your own house then you have to assume house property income on that.