Answer and Explanation:
The journal entries are shown below:
1. Equipment $90,000 Â
        To Cash $90,000
(Being the cost of the building is recorded)
For recording this we debited the equipment as it increased the assets and credited the cash as it decreased the assets Â
2. Cash $15,000 Â
     To Lease Revenue  $15,000
(Being the recognition of revenue is recorded) Â
For recording this we debited the cash as it increased the assets and credited the lease revenue as it also increased the revenue
3. Cash $15,000 Â
     To Lease Revenue  $15,000
(Being the recognition of revenue is recorded) Â
For recording this we debited the cash as it increased the assets and credited the lease revenue as it also increased the revenue
4. Depreciation $18,000  ($90,000 ÷ 5 years)
     To Accumulated depreciation $18,000
(Being the depreciation expense is recorded)
For recording this we debited the depreciation as it increased the expenses and credited the accumulated depreciation as it decreased the assets  Â