Patients requiring treatment with a RANKL inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab Patients may receive bisphosphonates or denosumab concurrently with study treatment; if started prior to registration, it must be started at least 7 days prior to registration Patients may be treated with bone modifying agents such as bisphosphonates or RANK-ligand agents (e.g. denosumab) per American Society of Clinical Oncology (ASCO) guidelines; whenever possible, patients requiring bone modifying agents should start treatment >= 7 days prior to study therapy and should continue the same agent throughout study unless clinically compelled to change Patients requiring treatment with a receptor activator of nuclear factor kappa-B ligand (RANKL) inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab Patients requiring treatment with a receptor activator of nuclear factor kappa-B ligand (RANKL) inhibitor (e.g., denosumab) who cannot discontinue it before treatment with atezolizumab Patients must not require treatment with a RANKL inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab Patients requiring treatment with a RANKL inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab Denosumab or zoledronic acid are allowed Is expected to require any other form of anti-cancer therapy while in the trial. Zoledronic acid or denosumab as supportive care for bone metastases will be allowed if started prior to study enrollment Patients requiring treatment with a RANKL inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab Bone metastases with prior history of pathologic fracture, lytic lesions requiring an orthopedic intervention, or not receiving bisphosphonates or denosumab Radiation therapy, chemotherapy, immunotherapy, investigational therapy or corticosteroid use within 2 weeks of or after eligibility-defining bone marrow biopsy. Bisphosphonates and denosumab are permitted if subject has been receiving for at least 90 days Patients requiring treatment with a RANKL inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab Initiation of bisphosphonate/denosumab therapy during the study; subjects on stable doses of bisphosphonates or the tumor necrosis factor receptor superfamily member 11a, subfamily L (RANK-L) inhibitor, denosumab, which have been started no less than 4 weeks prior to registration, may continue on this medication Concurrent osteoclast-inhibitory therapies (zoledronic acid, denosumab) are permitted if patients have been on a stable dose for at least 1 month The use of raloxifene, denosumab, or bisphosphonates for bone health is allowed Patients requiring treatment with a RANKL inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab Concurrent treatment with bisphosphonates or denosumab is required Concurrent anti-cancer therapy other than the ones specified in the protocol is not permitted during study participation; bisphosphonates or denosumab are allowed Patients who have a history of allergic reactions attributed to compounds of similar chemical or biologic composition to denosumab are not eligible (i.e. same class of drugs) (Note: prior bisphosphonates are allowed; patients could have received bisphosphonates or be bisphosphonate-naive; patients who were previously on bisphosphonates can be enrolled in the study, as long as they have a wash-out period of 2 weeks prior to registration) Subject has started treatment with denosumab < 1 month prior to study entry; subjects are allowed to be on bisphosphonates or denosumab provided they are on a stable dose for >= 4 weeks before administration of study drug Treatment with a receptor activator of nuclear factor kappa-B ligand (RANKL) inhibitor (e.g. denosumab) within 2 weeks of first study dose Prior chemotherapy for castration resistant disease; chemotherapy given in the hormone-sensitive setting is permissible if stopped at least 4 weeks prior to registration\r\n* Note: Patients can receive a stable dose of bisphosphonates for bone metastases, including zoledronic acid, or denosumab before and during the study as deemed appropriate by the treating physician UROTHELIAL CARCINOMA EXPANSION COHORT: Bisphosphonates and denosumab are permitted if on a stable dose for >= 4 weeks INCLUSION CRITERIA FOR TNBC: Patients may receive agents to protect against skeletal related complications such as zoledronic acid or denosumab Patients who are or are not receiving bisphosphonates or denosumab are eligible; bisphosphonates or denosumab should not be initiated after registration and during active treatment If a subject is currently receiving bisphosphonates or denosumab, the subject must have received the bisphosphonates or denosumab for at least four weeks before starting study treatment. (Initiation of bisphosphonates or denosumab during the study may be allowed provided the subject completes the first cycle of treatment without any DLT and the Investigator rules out tumor progression.) Patients on bisphosphonates, denosumab, and/or endocrine therapy are eligible Patients requiring treatment with a receptor activator of nuclear factor kappa-? ligand (RANKL) inhibitor (e.g., denosumab) who cannot discontinue it before initiation of study treatment Bisphosphonates and/or denosumab are allowed Concomitant use of bisphosphonates, receptor activator of nuclear factor kappa-? ligand (RANKL) antibody, and ovarian suppression is allowed Patients receiving bone loss prevention treatment with bone-modifying agents (e.g. denosumab, zoledronic acid) must be on stable doses for at least 4 weeks prior to randomization Treatment with bisphosphonates or denosumab is allowed and recommended per the standard of care Prior administration of denosumab Clinically significant hypersensitivity to denosumab or any components of denosumab 120 mg Treatment with denosumab (or other receptor activator of nuclear factor kappa-B ligand [RANKL] inhibitor) 4 weeks before the first dose and for 10 weeks after the last dose of atezolizumab Patients requiring treatment with a RANKL inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab The subject has started treatment with drugs used to control loss of bone mass (eg, bisphosphonates or denosumab) within 4 weeks prior to the first dose of study treatment Subject that started a bone modifying agent (e.g. bisphosphonates, denosumab) ? 28 days of study drug initiation (note: ongoing bone modifying agents administered > 28 days are allowed). Participants on bisphosphonates or receptor activator of nuclear factor kappa B (RANK) ligand inhibitors may continue receiving therapy during study treatment Subjects with bone metastases should be treated with intravenous bisphosphonates or subcutaneous denosumab (or investigator preferred standard of care) prior to and/or during the trial, unless there is a contraindication or subject intolerance to these therapies. For patients who are normocalcemic, therapy can be initiated at the time the patient initiates study drug Subject received bisphosphonates or denosumab within 2 weeks prior to day 1 unless administered at stable dose or to treat diagnosed osteoporosis Have initiated bisphosphonates or approved receptor activator of nuclear factor kappa-B ligand (RANK-L) targeted agents <7 days prior to randomization Oral examination and appropriate preventive dentistry will be performed prior to the initiation of denosumab therapy. History of hypersensitivity to denosumab. Patients requiring treatment with a RANKL inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab Patients who have previously received denosumab Patients receiving bisphosphonates Initiation of new treatment with denosumab, bisphosphonates, or systemic corticosteroids for treatment of prostate cancer within 4 weeks before enrollment; Plans to begin bisphosphonates or denosumab after registration or began therapy regiment =< 30 days from registration\r\n* NOTE: patients on a stable dose of bisphosphonates or denosumab > 30 days prior to registration are acceptable Have initiated bisphosphonates or approved Receptor activator of nuclear factor kappa-B (RANK) ligand targeted agents <7 days prior to randomization Patients currently receiving bone loss prevention treatment (e.g. bisphosphonates, denosumab, etc.) must be on a stable dose for at least 4 weeks prior to starting study treatment Bisphosphonate (e.g. zoledronic acid) and receptor activator of nuclear transcription factor kappa-B (NF-kappaB) ligand (RANKL) inhibitor (e.g. denosumab) use for bone metastasis is permitted At least a 4 week interval from previous prostate cancer treatment other than LHRH agonist/antagonist therapy, bisphosphonates, denosumab to the start of protocol therapy Participants receiving bisphosphonates therapy or denosumab can be maintained on this therapy; if participants have not started bisphosphonates, it is recommended that they start treatment after the first (optional) biopsy Zometa or denosumab can be continued as per standard of care as long as started before the study treatment is started At least a 4 week interval from previous prostate cancer treatment other than LHRH agonist/antagonist therapy, bisphosphonates, or denosumab to enrollment Participants receiving bisphosphonates therapy or denosumab can be maintained on this therapy; if participants have not started bisphosphonates or denosumab, it is recommended that they start treatment after the first biopsy Participants may not be receiving any other investigational agents; concurrent treatment with bisphosphonates or denosumab is allowed Patients on stable doses of bisphosphonates or denosumab which have been started prior to registration may continue on this medication, patients who are not on bisphosphonates or denosumab are eligible as long as they initiate therapy prior to registration Any experimental drug while on this study; however, concomitant bone targeted therapy (bisphosphonates or the anti-tumor necrosis factor receptor superfamily, member 11a, NFKB activator [RANK] ligand denosumab) is allowed Patients requiring treatment with a receptor activator of nuclear factor kappa-B ligand (RANKL) inhibitor (e.g. denosumab) who cannot discontinue it before treatment with atezolizumab For patients receiving bone-loss prevention treatment (e.g., bisphosphonates or denosumab), the patient must be on stable dose ?4 weeks prior to start of study drug. Patients may or may not have started bisphosphonates Subjects with bone metastases should be treated with intravenous bisphosphonates or subcutaneous denosumab (or investigator preferred standard of care) prior to and during the trial, unless there is a contraindication or subject intolerance to these therapies Currently receiving anti-cancer therapy. Exceptions: Zoledronic acid and denosumab to treat bone metastasis are allowed. Prior administration of denosumab Have initiated treatment with bisphosphonates or approved receptor activator of nuclear factor kappa-B ligand (RANK-L) targeted agents (e.g. denosumab) ? 28 days prior to Day 1 of Cycle 1. Bisphosphonates and denosumab are permitted, if on a stable dose for >= 4 weeks Patient may receive bisphosphonates/denosumab for the palliation of bone metastases Have initiated treatment with bisphosphonates or approved receptor activator of nuclear factor kappa-B ligand (RANK-L) targeted agents (e.g. denosumab) ?28 days prior to day 1 of cycle 1. Bone-directed therapy (e.g., bisphosphonates or denosumab) is permitted. Prior and ongoing zoledronic acid or denosumab therapy is allowed Bisphosphonates/tumor necrosis factor receptor super family, member 11a (RANK)-ligand inhibitor allowed if started prior to study treatment Patients who have not discontinued all prior medical therapy for breast cancer (with the exception of bisphosphonates or denosumab) at least 21 days prior to first dose of orteronel; this includes patients who have received other investigational agents within 21 days prior to the first dose of orteronel Prior and/or planned concomitant medical therapy during the study period (through day 360 post-HCT) with other bisphosphonates, denosumab, or teriparatide Be diagnosed with bone metastases subsequent to breast (female subjects only) or prostate carcinoma, and will have received zoledronate or denosumab therapy for at least 3 months at the time of enrollment Prior administration of denosumab Patients must be at least 28 days post cytotoxic chemotherapy, radiotherapy, monoclonal antibody and/or other biologic therapy, prior to enrollment; patients on bisphosphonates, denosumab, and/or endocrine therapy and may continue throughout duration of study Participants must be willing to take supplemental oral calcium 1000 mg and vitamin D3 1000 IU daily for six months (which will be supplied by the research study) after receiving denosumab treatment or no treatment History of allergic reactions or hypersensitivity attributed to denosumab or any components of denosumab or compounds of similar chemical or biologic composition to denosumab, such as other RANKL inhibitors Subjects must be on therapy with bisphosphonates or denosumab for at least 1 month before start of study treatment. Patients on stable doses of bisphosphonates or the receptor activator of RANK-L inhibitor, denosumab, which have been started no less than 4 weeks prior to treatment start, may continue on this medication, however patients are not allowed to initiate bisphosphonate/denosumab therapy during the study Current or prior use of bone active medication (bisphosphonates, teriparatide, selective estrogen receptor modulators, or denosumab)