notes receivable in 2014 , we entered into a $ 3.0 million promissory note with a privately held company which was recorded at cost . the interest rate on the promissory note is 8.0% ( 8.0 % ) per annum and is payable quarterly . all unpaid principal and accrued interest on the promissory note is due and payable on the earlier of august 26 , 2017 , or upon default . 5 . commitments and contingencies operating leases we lease various operating spaces in north america , europe , asia and australia under non-cancelable operating lease arrangements that expire on various dates through 2024 . these arrangements require us to pay certain operating expenses , such as taxes , repairs , and insurance and contain renewal and escalation clauses . we recognize rent expense under these arrangements on a straight-line basis over the term of the lease . as of december 31 , 2015 , the aggregate future minimum payments under non-cancelable operating leases consist of the following ( in thousands ) : years ending december 31 .

$ 6306: 2017: 6678
2018: 6260
2019: 5809
2020: 5580
thereafter: 21450
total minimum future lease payments: 52083

rent expense for all operating leases amounted to $ 6.7 million , $ 3.3 million and $ 3.6 million for the years ended december 31 , 2015 , 2014 and 2013 , respectively . financing obligation 2014build-to-suit lease in august 2012 , we executed a lease for a building then under construction in santa clara , california to serve as our headquarters . the lease term is 120 months and commenced in august 2013 . based on the terms of the lease agreement and due to our involvement in certain aspects of the construction such as our financial involvement in structural elements of asset construction , making decisions related to tenant improvement costs and purchasing insurance not reimbursable by the buyer-lessor ( the landlord ) , we were deemed the owner of the building ( for accounting purposes only ) during the construction period . we continue to maintain involvement in the property post construction completion and lack transferability of the risks and rewards of ownership , due to our required maintenance of a $ 4.0 million letter of credit , in addition to our ability and option to sublease our portion of the leased building for fees substantially higher than our base rate . due to our continued involvement in the property and lack of transferability of related risks and rewards of ownership to the landlord post construction , we account for the building and related improvements as a lease financing obligation . accordingly , as of december 31 , 2015 and 2014 , we have recorded assets of $ 53.4 million , representing the total costs of the building and improvements incurred , including the costs paid by the lessor ( the legal owner of the building ) and additional improvement costs paid by us , and a corresponding financing obligation of $ 42.5 million and $ 43.6 million , respectively . as of december 31 , 2015 , $ 1.3 million and $ 41.2 million were recorded as short-term and long-term financing obligations , respectively . land lease expense under our lease financing obligation included in rent expense above , amounted to $ 1.3 million and $ 1.2 million for the years ended december 31 , 2015 and 2014 , respectively . there was no land lease expense for the year ended december 31 , 2013. .

Questions:
as of december 31, 2015, what percentage did the 2016 non-cancelable operating leases represent in relation to the total minimum future lease payments?
and throughout that same year, what was the change in those operating leases, counted in millions?
what is this change as a portion of those leases in the beginning of 2015?

Answers:
12.1%
3.4
103.0%